IssueTracker

I built AGP from studio-master-dev, and when I build I see these lines in the output:

Caught exception: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2 path $
Caught exception: com.google.gson.JsonSyntaxException: java.lang.IllegalStateException: Expected BEGIN_OBJECT but was BEGIN_ARRAY at line 1 column 2 path $

In addition to the error showing up, notice how the path isn't helpful ($).

I attached with a debugger and found that it's reading this file:
<path-to-my-project>/app/build/outputs/apk/debug
which contains (all on one line)
[{"outputType":{"type":"APK"},"apkData":{"type":"MAIN","splits":[],"versionCode":1,"versionName":"1.0","enabled":true,"outputFile":"app-debug.apk","fullName":"debug","baseName":"debug","dirName":""},"path":"app-debug.apk","properties":{}}]

and it's called from here:

<init>:45, JsonSyntaxException (com.google.gson)
read:226, ReflectiveTypeAdapterFactory$Adapter (com.google.gson.internal.bind)
fromJson:927, Gson (com.google.gson)
fromJson:865, Gson (com.google.gson)
load:181, ExistingBuildElements$Companion (com.android.build.gradle.internal.scope)
loadFrom:119, ExistingBuildElements$Companion (com.android.build.gradle.internal.scope)
from:97, ExistingBuildElements$Companion (com.android.build.gradle.internal.scope)
loadFile:73, EarlySyncBuildOutput$Companion (com.android.build.gradle.internal.ide)
load:64, EarlySyncBuildOutput$Companion (com.android.build.gradle.internal.ide)
load:-1, EarlySyncBuildOutput (com.android.build.gradle.internal.ide)
lambda$get$2:55, BuildOutputsSupplier (com.android.build.gradle.internal.ide)
accept:-1, 1529725722 (com.android.build.gradle.internal.ide.BuildOutputsSupplier$$Lambda$761)
forEach:405, ImmutableList (com.google.common.collect)
get:49, BuildOutputsSupplier (com.android.build.gradle.internal.ide)
get:34, BuildOutputsSupplier (com.android.build.gradle.internal.ide)
getOutputs:174, AndroidArtifactImpl (com.android.build.gradle.internal.ide)
copyOutputs:153, IdeAndroidArtifactImpl (com.android.ide.common.gradle.model)
<init>:98, IdeAndroidArtifactImpl (com.android.ide.common.gradle.model)
lambda$new$0:78, IdeVariantImpl (com.android.ide.common.gradle.model)
apply:-1, 215796487 (com.android.ide.common.gradle.model.IdeVariantImpl$$Lambda$730)
computeIfAbsent:59, ModelCache (com.android.ide.common.gradle.model)
<init>:75, IdeVariantImpl (com.android.ide.common.gradle.model)
lambda$create$4:140, IdeAndroidProjectImpl (com.android.ide.common.gradle.model)
apply:-1, 779670639 (com.android.ide.common.gradle.model.IdeAndroidProjectImpl$$Lambda$729)
computeIfAbsent:59, ModelCache (com.android.ide.common.gradle.model)
copy:86, IdeModel (com.android.ide.common.gradle.model)
create:136, IdeAndroidProjectImpl (com.android.ide.common.gradle.model)
create:91, IdeAndroidProjectImpl (com.android.ide.common.gradle.model)
createAndroidProject:381, LintGradleExecution (com.android.tools.lint.gradle)
analyze:90, LintGradleExecution (com.android.tools.lint.gradle)
invoke0:-1, NativeMethodAccessorImpl (sun.reflect)
invoke:62, NativeMethodAccessorImpl (sun.reflect)
invoke:43, DelegatingMethodAccessorImpl (sun.reflect)
invoke:498, Method (java.lang.reflect)
runLint:38, ReflectiveLintRunner (com.android.tools.lint.gradle.api)
runLint:114, LintBaseTask (com.android.build.gradle.tasks)
lint:64, LintPerVariantTask (com.android.build.gradle.tasks)
invoke0:-1, NativeMethodAccessorImpl (sun.reflect)
invoke:62, NativeMethodAccessorImpl (sun.reflect)
invoke:43, DelegatingMethodAccessorImpl (sun.reflect)
invoke:498, Method (java.lang.reflect)
invoke:104, JavaMethod (org.gradle.internal.reflect)
doExecute:49, StandardTaskAction (org.gradle.api.internal.project.taskfactory)
execute:42, StandardTaskAction (org.gradle.api.internal.project.taskfactory)
execute:28, StandardTaskAction (org.gradle.api.internal.project.taskfactory)
execute:727, AbstractTask$TaskActionWrapper (org.gradle.api.internal)
execute:694, AbstractTask$TaskActionWrapper (org.gradle.api.internal)
run:568, ExecuteActionsTaskExecuter$3 (org.gradle.api.internal.tasks.execution)
execute:402, DefaultBuildOperationExecutor$RunnableBuildOperationWorker (org.gradle.internal.operations)
execute:394, DefaultBuildOperationExecutor$RunnableBuildOperationWorker (org.gradle.internal.operations)
execute:165, DefaultBuildOperationExecutor$1 (org.gradle.internal.operations)
execute:250, DefaultBuildOperationExecutor (org.gradle.internal.operations)
execute:158, DefaultBuildOperationExecutor (org.gradle.internal.operations)
run:92, DefaultBuildOperationExecutor (org.gradle.internal.operations)
run:31, DelegatingBuildOperationExecutor (org.gradle.internal.operations)
executeAction:553, ExecuteActionsTaskExecuter (org.gradle.api.internal.tasks.execution)
executeActions:536, ExecuteActionsTaskExecuter (org.gradle.api.internal.tasks.execution)
access$300:109, ExecuteActionsTaskExecuter (org.gradle.api.internal.tasks.execution)
executeWithPreviousOutputFiles:276, ExecuteActionsTaskExecuter$TaskExecution (org.gradle.api.internal.tasks.execution)
execute:265, ExecuteActionsTaskExecuter$TaskExecution (org.gradle.api.internal.tasks.execution)
lambda$execute$1:33, ExecuteStep (org.gradle.internal.execution.steps)
get:-1, 381305341 (org.gradle.internal.execution.steps.ExecuteStep$$Lambda$681)
orElseGet:267, Optional (java.util)
execute:33, ExecuteStep (org.gradle.internal.execution.steps)
execute:26, ExecuteStep (org.gradle.internal.execution.steps)
execute:63, CleanupOutputsStep (org.gradle.internal.execution.steps)
execute:35, CleanupOutputsStep (org.gradle.internal.execution.steps)
execute:49, ResolveInputChangesStep (org.gradle.internal.execution.steps)
execute:34, ResolveInputChangesStep (org.gradle.internal.execution.steps)
execute:43, CancelExecutionStep (org.gradle.internal.execution.steps)
executeWithoutTimeout:73, TimeoutStep (org.gradle.internal.execution.steps)
execute:54, TimeoutStep (org.gradle.internal.execution.steps)
execute:34, CatchExceptionStep (org.gradle.internal.execution.steps)
execute:44, CreateOutputsStep (org.gradle.internal.execution.steps)
execute:54, SnapshotOutputsStep (org.gradle.internal.execution.steps)
execute:38, SnapshotOutputsStep (org.gradle.internal.execution.steps)
execute:49, BroadcastChangingOutputsStep (org.gradle.internal.execution.steps)
executeWithoutCache:153, CacheStep (org.gradle.internal.execution.steps)
execute:67, CacheStep (org.gradle.internal.execution.steps)
execute:41, CacheStep (org.gradle.internal.execution.steps)
execute:44, StoreExecutionStateStep (org.gradle.internal.execution.steps)
execute:33, StoreExecutionStateStep (org.gradle.internal.execution.steps)
execute:38, RecordOutputsStep (org.gradle.internal.execution.steps)
execute:24, RecordOutputsStep (org.gradle.internal.execution.steps)
executeBecause:92, SkipUpToDateStep (org.gradle.internal.execution.steps)
lambda$execute$0:85, SkipUpToDateStep (org.gradle.internal.execution.steps)
apply:-1, 673443880 (org.gradle.internal.execution.steps.SkipUpToDateStep$$Lambda$538)
map:215, Optional (java.util)
execute:55, SkipUpToDateStep (org.gradle.internal.execution.steps)
execute:39, SkipUpToDateStep (org.gradle.internal.execution.steps)
execute:76, ResolveChangesStep (org.gradle.internal.execution.steps)
execute:37, ResolveChangesStep (org.gradle.internal.execution.steps)
execute:36, MarkSnapshottingInputsFinishedStep (org.gradle.internal.execution.steps.legacy)
execute:26, MarkSnapshottingInputsFinishedStep (org.gradle.internal.execution.steps.legacy)
execute:94, ResolveCachingStateStep (org.gradle.internal.execution.steps)
execute:49, ResolveCachingStateStep (org.gradle.internal.execution.steps)
execute:79, CaptureStateBeforeExecutionStep (org.gradle.internal.execution.steps)
execute:53, CaptureStateBeforeExecutionStep (org.gradle.internal.execution.steps)
execute:74, ValidateStep (org.gradle.internal.execution.steps)
lambda$execute$2:78, SkipEmptyWorkStep (org.gradle.internal.execution.steps)
get:-1, 928618461 (org.gradle.internal.execution.steps.SkipEmptyWorkStep$$Lambda$435)
orElseGet:267, Optional (java.util)
execute:78, SkipEmptyWorkStep (org.gradle.internal.execution.steps)
execute:34, SkipEmptyWorkStep (org.gradle.internal.execution.steps)
execute:39, MarkSnapshottingInputsStartedStep (org.gradle.internal.execution.steps.legacy)
execute:40, LoadExecutionStateStep (org.gradle.internal.execution.steps)
execute:28, LoadExecutionStateStep (org.gradle.internal.execution.steps)
execute:33, DefaultWorkExecutor (org.gradle.internal.execution.impl)
executeIfValid:192, ExecuteActionsTaskExecuter (org.gradle.api.internal.tasks.execution)
execute:184, ExecuteActionsTaskExecuter (org.gradle.api.internal.tasks.execution)
execute:109, CleanupStaleOutputsExecuter (org.gradle.api.internal.tasks.execution)
execute:46, FinalizePropertiesTaskExecuter (org.gradle.api.internal.tasks.execution)
execute:62, ResolveTaskExecutionModeExecuter (org.gradle.api.internal.tasks.execution)
execute:57, SkipTaskWithNoActionsExecuter (org.gradle.api.internal.tasks.execution)
execute:56, SkipOnlyIfTaskExecuter (org.gradle.api.internal.tasks.execution)
execute:36, CatchExceptionTaskExecuter (org.gradle.api.internal.tasks.execution)
executeTask:77, EventFiringTaskExecuter$1 (org.gradle.api.internal.tasks.execution)
call:55, EventFiringTaskExecuter$1 (org.gradle.api.internal.tasks.execution)
call:52, EventFiringTaskExecuter$1 (org.gradle.api.internal.tasks.execution)
execute:416, DefaultBuildOperationExecutor$CallableBuildOperationWorker (org.gradle.internal.operations)
execute:406, DefaultBuildOperationExecutor$CallableBuildOperationWorker (org.gradle.internal.operations)
execute:165, DefaultBuildOperationExecutor$1 (org.gradle.internal.operations)
execute:250, DefaultBuildOperationExecutor (org.gradle.internal.operations)
execute:158, DefaultBuildOperationExecutor (org.gradle.internal.operations)
call:102, DefaultBuildOperationExecutor (org.gradle.internal.operations)
call:36, DelegatingBuildOperationExecutor (org.gradle.internal.operations)
execute:52, EventFiringTaskExecuter (org.gradle.api.internal.tasks.execution)
execute:41, LocalTaskNodeExecutor (org.gradle.execution.plan)
execute:372, DefaultTaskExecutionGraph$InvokeNodeExecutorsAction (org.gradle.execution.taskgraph)
execute:359, DefaultTaskExecutionGraph$InvokeNodeExecutorsAction (org.gradle.execution.taskgraph)
execute:352, DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction (org.gradle.execution.taskgraph)
execute:338, DefaultTaskExecutionGraph$BuildOperationAwareExecutionAction (org.gradle.execution.taskgraph)
lambda$run$0:127, DefaultPlanExecutor$ExecutorWorker (org.gradle.execution.plan)
execute:-1, 1971193656 (org.gradle.execution.plan.DefaultPlanExecutor$ExecutorWorker$$Lambda$594)
execute:191, DefaultPlanExecutor$ExecutorWorker (org.gradle.execution.plan)
executeNextNode:182, DefaultPlanExecutor$ExecutorWorker (org.gradle.execution.plan)
run:124, DefaultPlanExecutor$ExecutorWorker (org.gradle.execution.plan)
onExecute:64, ExecutorPolicy$CatchAndRecordFailures (org.gradle.internal.concurrent)
run:48, ManagedExecutorImpl$1 (org.gradle.internal.concurrent)
runWorker:1149, ThreadPoolExecutor (java.util.concurrent)
run:624, ThreadPoolExecutor$Worker (java.util.concurrent)
run:56, ThreadFactoryImpl$ManagedThreadRunnable (org.gradle.internal.concurrent)
run:748, Thread (java.lang)