compile issue

[sander53134512]

Executing tasks: [:app:assembleOpensourceRelease] in project /home/tyler/StudioProjects/altidroid

Configure project :app
The com.google.protobuf plugin was already applied to the project: :app and will not be applied again after plugin: android
WARNING: API 'variant.getJavaCompile()' is obsolete and has been replaced with 'variant.getJavaCompileProvider()'.
It will be removed at the end of 2019.
For more information, see https://d.android.com/r/tools/task-configuration-avoidance.
To determine what is calling variant.getJavaCompile(), use -Pandroid.debug.obsoleteApi=true on the command line to display a stack trace.

Task :app:preBuild UP-TO-DATE
Task :app:extractProguardFiles UP-TO-DATE
Task :app:preOpensourceReleaseBuild UP-TO-DATE
Task :app:compileOpensourceReleaseAidl NO-SOURCE
Task :app:compileOpensourceReleaseRenderscript UP-TO-DATE
Task :app:checkOpensourceReleaseManifest UP-TO-DATE
Task :app:generateOpensourceReleaseBuildConfig UP-TO-DATE
Task :app:extractIncludeOpensourceReleaseProto UP-TO-DATE
Task :app:extractOpensourceProto UP-TO-DATE
Task :app:extractOpensourceReleaseProto UP-TO-DATE
Task :app:extractProto UP-TO-DATE
Task :app:extractReleaseProto UP-TO-DATE
Task :app:generateOpensourceReleaseProto UP-TO-DATE
Task :app:prepareLintJar UP-TO-DATE
Task :app:generateOpensourceReleaseSources UP-TO-DATE
Task :app:javaPreCompileOpensourceRelease UP-TO-DATE
Task :app:mainApkListPersistenceOpensourceRelease UP-TO-DATE
Task :app:generateOpensourceReleaseResValues UP-TO-DATE
Task :app:generateOpensourceReleaseResources UP-TO-DATE
Task :app:mergeOpensourceReleaseResources UP-TO-DATE
Task :app:createOpensourceReleaseCompatibleScreenManifests UP-TO-DATE
Task :app:processOpensourceReleaseManifest UP-TO-DATE
Task :app:processOpensourceReleaseResources UP-TO-DATE
Task :app:compileOpensourceReleaseJavaWithJavac UP-TO-DATE
Task :app:compileOpensourceReleaseNdk NO-SOURCE
Task :app:compileOpensourceReleaseSources UP-TO-DATE
Task :app:lintVitalOpensourceRelease
Task :app:mergeOpensourceReleaseShaders UP-TO-DATE
Task :app:compileOpensourceReleaseShaders UP-TO-DATE
Task :app:generateOpensourceReleaseAssets UP-TO-DATE
Task :app:mergeOpensourceReleaseAssets UP-TO-DATE
Task :app:validateSigningOpensourceRelease UP-TO-DATE
Task :app:signingConfigWriterOpensourceRelease UP-TO-DATE
Task :app:processOpensourceReleaseJavaRes NO-SOURCE
Task :app:transformResourcesWithMergeJavaResForOpensourceRelease UP-TO-DATE
ProGuard, version 6.0.3
Reading input...
Reading program jar [/home/tyler/.gradle/caches/transforms-1/files-1.1/design-27.1.1.aar/ca91b74ce50f8ea8c506b3280414e3a2/jars/classes.jar] (filtered)
Reading program jar [/home/tyler/.gradle/caches/transforms-1/files-1.1/appcompat-v7-27.1.1.aar/65686fbb78900341206b9a9131bc2767/jars/classes.jar] (filtered)
Reading program jar [/home/tyler/.gradle/caches/modules-2/files-2.1/com.google.protobuf/protobuf-lite/3.0.1/59b5b9c6e1a3054696d23492f888c1f8b583f5fc/protobuf-lite-3.0.1.jar] (filtered)
Reading program jar [/home/tyler/.gradle/caches/transforms-1/files-1.1/support-v4-27.1.1.aar/a1475ad148f0c24d0bc0e37390037a42/jars/classes.jar] (filtered)
Reading program jar [/home/tyler/.gradle/caches/transforms-1/files-1.1/recyclerview-v7-27.1.1.aar/4f9e77c40240aeb97eafe9b5f1014f4f/jars/classes.jar] (filtered)
Reading program jar [/home/tyler/.gradle/caches/transforms-1/files-1.1/transition-27.1.1.aar/5ad95ed19d7b506e4e38a858c657fcbb/jars/classes.jar] (filtered)
Reading program jar [/home/tyler/.gradle/caches/transforms-1/files-1.1/support-fragment-27.1.1.aar/fbd2deb68d5b1dc0e53c6d1d536ba4c9/jars/classes.jar] (filtered)
Reading program jar [/home/tyler/.gradle/caches/transforms-1/files-1.1/animated-vector-drawable-27.1.1.aar/e20065489480fe23d0f91368de7dd49f/jars/classes.jar] (filtered)
Reading program jar [/home/tyler/.gradle/caches/transforms-1/files-1.1/support-core-ui-27.1.1.aar/fbf274a137fbdde8bf6ec334a909e8d5/jars/classes.jar] (filtered)
Reading program jar [/home/tyler/.gradle/caches/transforms-1/files-1.1/support-core-utils-27.1.1.aar/4f710e2ae226989c402bc01d21bad13a/jars/classes.jar] (filtered)
Reading program jar [/home/tyler/.gradle/caches/transforms-1/files-1.1/support-vector-drawable-27.1.1.aar/af3a7ffe1fc0aa26a970da62e0f74e96/jars/classes.jar] (filtered)
Reading program jar [/home/tyler/.gradle/caches/transforms-1/files-1.1/support-media-compat-27.1.1.aar/923e2a5304c4168a7a8000b3e573e70e/jars/classes.jar] (filtered)
Reading program jar [/home/tyler/.gradle/caches/transforms-1/files-1.1/support-compat-27.1.1.aar/4e334936fac53e59c80053e25421451b/jars/classes.jar] (filtered)
Reading program jar [/home/tyler/.gradle/caches/modules-2/files-2.1/com.android.support/support-annotations/27.1.1/39ded76b5e1ce1c5b2688e1d25cdc20ecee32007/support-annotations-27.1.1.jar] (filtered)
Reading program jar [/home/tyler/.gradle/caches/transforms-1/files-1.1/livedata-core-1.1.0.aar/c18dffcc804e1f71553fdafac5890942/jars/classes.jar] (filtered)
Reading program jar [/home/tyler/.gradle/caches/transforms-1/files-1.1/viewmodel-1.1.0.aar/c6adca313979424fdc48a15ec4dcd6aa/jars/classes.jar] (filtered)
Reading program jar [/home/tyler/.gradle/caches/transforms-1/files-1.1/runtime-1.1.0.aar/6d69aeb4f5cd800c2467ee2f3a653233/jars/classes.jar] (filtered)
Reading program jar [/home/tyler/.gradle/caches/modules-2/files-2.1/android.arch.lifecycle/common/1.1.0/edf3f7bfb84a7521d0599efa3b0113a0ee90f85/common-1.1.0.jar] (filtered)
Reading program jar [/home/tyler/.gradle/caches/transforms-1/files-1.1/runtime-1.1.0.aar/bff00ba60426836cb1641c93ebd872f2/jars/classes.jar] (filtered)
Reading program jar [/home/tyler/.gradle/caches/modules-2/files-2.1/android.arch.core/common/1.1.0/8007981f7d7540d89cd18471b8e5dcd2b4f99167/common-1.1.0.jar] (filtered)
Reading program directory [/home/tyler/StudioProjects/altidroid/app/build/intermediates/javac/opensourceRelease/compileOpensourceReleaseJavaWithJavac/classes] (filtered)
Reading program jar [/home/tyler/StudioProjects/altidroid/app/build/intermediates/transforms/mergeJavaRes/opensource/release/0.jar] (filtered)
Reading library jar [/home/tyler/Android/Sdk/platforms/android-27/android.jar]
Reading library jar [/home/tyler/Android/Sdk/build-tools/28.0.3/core-lambda-stubs.jar]
Reading library jar [/home/tyler/Android/Sdk/platforms/android-27/optional/org.apache.http.legacy.jar]
Initializing...
Warning: com.google.protobuf.UnsafeUtil: can't find referenced class sun.misc.Unsafe
Warning: com.google.protobuf.UnsafeUtil: can't find referenced class sun.misc.Unsafe
Warning: com.google.protobuf.UnsafeUtil: can't find referenced class sun.misc.Unsafe
Warning: com.google.protobuf.UnsafeUtil: can't find referenced class sun.misc.Unsafe
Warning: com.google.protobuf.UnsafeUtil: can't find referenced class sun.misc.Unsafe
Warning: com.google.protobuf.UnsafeUtil: can't find referenced class sun.misc.Unsafe
Warning: com.google.protobuf.UnsafeUtil: can't find referenced class sun.misc.Unsafe
Warning: com.google.protobuf.UnsafeUtil: can't find referenced class sun.misc.Unsafe
Warning: com.google.protobuf.UnsafeUtil: can't find referenced class sun.misc.Unsafe
Warning: com.google.protobuf.UnsafeUtil: can't find referenced class sun.misc.Unsafe
Warning: com.google.protobuf.UnsafeUtil: can't find referenced class sun.misc.Unsafe
Warning: com.google.protobuf.UnsafeUtil: can't find referenced class sun.misc.Unsafe
Warning: com.google.protobuf.UnsafeUtil: can't find referenced class sun.misc.Unsafe
Warning: com.google.protobuf.UnsafeUtil: can't find referenced class sun.misc.Unsafe
Warning: com.google.protobuf.UnsafeUtil: can't find referenced class sun.misc.Unsafe
Warning: com.google.protobuf.UnsafeUtil$1: can't find referenced class sun.misc.Unsafe
Warning: com.google.protobuf.UnsafeUtil$1: can't find referenced class sun.misc.Unsafe
Warning: com.google.protobuf.UnsafeUtil$1: can't find referenced class sun.misc.Unsafe
Warning: com.google.protobuf.UnsafeUtil$1: can't find referenced class sun.misc.Unsafe
Note: com.google.protobuf.ExtensionRegistryFactory: can't find dynamically referenced class com.google.protobuf.ExtensionRegistry
Note: com.google.protobuf.ExtensionRegistryLite: can't find dynamically referenced class com.google.protobuf.Extension
Note: the configuration keeps the entry point 'org.openskydive.altidroid.ui.VerticalSeekBar { void setOnSeekListener(org.openskydive.altidroid.ui.VerticalSeekBar$OnSeekListener); }', but not the descriptor class 'org.openskydive.altidroid.ui.VerticalSeekBar$OnSeekListener'
Note: there were 1 unkept descriptor classes in kept class members.
You should consider explicitly keeping the mentioned classes
(using '-keep').
(http://proguard.sourceforge.net/manual/troubleshooting.html#descriptorclass)
Note: there were 2 unresolved dynamic references to classes or interfaces.
You should check if you need to specify additional program jars.
(http://proguard.sourceforge.net/manual/troubleshooting.html#dynamicalclass)
Warning: there were 19 unresolved references to classes or interfaces.
You may need to add missing library jars or update their versions.
If your code works fine without the missing classes, you can suppress
the warnings with '-dontwarn' options.
(http://proguard.sourceforge.net/manual/troubleshooting.html#unresolvedclass)
Warning: Exception while processing task java.io.IOException: Please correct the above warnings first.
Thread(Tasks limiter_1): destruction

Task :app:transformClassesAndResourcesWithProguardForOpensourceRelease FAILED
Request to incrementing alive workforce from 0. Current workforce (dead or alive) 0
thread-pool size=4

FAILURE: Build failed with an exception.

• What went wrong:
  Execution failed for task ':app:transformClassesAndResourcesWithProguardForOpensourceRelease'.

Job failed, see logs for details

• Try:
  Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output. Run with --scan to get full insights.

• Get more help at https://help.gradle.org

Deprecated Gradle features were used in this build, making it incompatible with Gradle 5.0.
Use '--warning-mode all' to show the individual deprecation warnings.
See https://docs.gradle.org/4.10.3/userguide/command_line_interface.html#sec:command_line_warnings

BUILD FAILED in 7s
28 actionable tasks: 2 executed, 26 up-to-date

[sander53134512]

any tips? I'm not a developer