Ionic 2 Build Error

I want to create a package so i can test the app on my android phone. But every time i try to build it i get and error.

ANDROID_HOME=/usr/local/src/android-sdk-linux
JAVA_HOME=/usr/lib/jvm/java-8-oracle
:preBuild UP-TO-DATE
:preDebugBuild UP-TO-DATE
:checkDebugManifest
:CordovaLib:preBuild UP-TO-DATE
:CordovaLib:preDebugBuild UP-TO-DATE
:CordovaLib:compileDebugNdk UP-TO-DATE
:CordovaLib:compileLint
:CordovaLib:copyDebugLint UP-TO-DATE
:CordovaLib:mergeDebugProguardFiles
:CordovaLib:packageDebugRenderscript UP-TO-DATE
:CordovaLib:checkDebugManifest
:CordovaLib:prepareDebugDependencies
:CordovaLib:compileDebugRenderscript
:CordovaLib:generateDebugResValues
:CordovaLib:generateDebugResources
:CordovaLib:packageDebugResources
:CordovaLib:compileDebugAidl
:CordovaLib:generateDebugBuildConfig
:CordovaLib:generateDebugAssets UP-TO-DATE
:CordovaLib:mergeDebugAssets
:CordovaLib:processDebugManifest
:CordovaLib:processDebugResources
:CordovaLib:generateDebugSources
:CordovaLib:compileDebugJavaWithJavacNote: Some input files use or override a deprecated API.
Note: Recompile with -Xlint:deprecation for details.

:CordovaLib:processDebugJavaRes UP-TO-DATE
:CordovaLib:transformResourcesWithMergeJavaResForDebug
:CordovaLib:transformClassesAndResourcesWithSyncLibJarsForDebug
:CordovaLib:mergeDebugJniLibFolders
:CordovaLib:transformNative_libsWithMergeJniLibsForDebug
:CordovaLib:transformNative_libsWithSyncJniLibsForDebug
:CordovaLib:bundleDebug
:prepareAndroidCordovaLibUnspecifiedDebugLibrary
:prepareDebugDependencies
:compileDebugAidl
:compileDebugRenderscript
:generateDebugBuildConfig
:generateDebugAssets UP-TO-DATE
:mergeDebugAssets

FAILURE: Build failed with an exception.

  • What went wrong:
    Could not list contents of ‘/home/package/workspace/apps-e7628570-7/cordova/platforms/android/assets/www/assets/img/mannschaften/gm??nd.jpg’.

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

BUILD FAILED

Total time: 6.773 secs
Error: Error code 1 for command: /home/package/workspace/apps-e7628570-7/cordova/platforms/android/gradlew with args: cdvBuildDebug,-b,/home/package/workspace/apps-e7628570-7/cordova/platforms/android/build.gradle,-Dorg.gradle.daemon=true,-Pandroid.useDeprecatedNdk=true