Djava.source1.7 error

Hello! I want to upload my apk on Google Play and I can’t pass this error UATHelper: Packaging (Android (ETC1)): ERROR: cmd.exe failed with args /c “F:/NVPACK/apache-ant-1.8.2/bin/ant.bat” release -Djava.source=1.7 -Djava.target=1.7. I don’t know what to do. Please help me!

Have you find its solution?