# Please help me roll back gradle

**URL:** <https://discuss.gradle.org/t/please-help-me-roll-back-gradle/32367>\
**Category:** Help/Discuss\
**Created:** [July 10, 2019, 1:48pm UTC](https://discuss.gradle.org/t/please-help-me-roll-back-gradle/32367 "2019-07-10T13:48:30Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Gourmand](https://avatars.discourse-cdn.com/v4/letter/g/3ec8ea/32.png) [@Gourmand](https://discuss.gradle.org/u/Gourmand)\
**Post date:** [July 10, 2019, 1:48pm UTC](https://discuss.gradle.org/t/please-help-me-roll-back-gradle/32367/1 "2019-07-10T13:48:30Z")

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I develop Android apps on Qt5/C++ on Linux workstation. I have made and published many apps for API 26 via gradle 2.2.3. To meet Google 64-bit compatibility requirements I experimented with latest Qt5 versions and in one project I changed gradle.properties settings to  
androidBuildToolsVersion=28.0.2  
androidCompileSdkVersion=28  
All other projects contained lines for API 26. After that I returned to API 26 cause support of API 28 in Qt5 is not ready yet. But I have forgotten change lines above back to API 26. Then I started build this project - the Android Studio (it runs at background) suddenly and without my permission downloaded and installed gradle 3.x. With it all other projects appear broken - they cannot build APKs with bunch of errors related to Google Play services. They ignore requests to build for API 26 and try build for API 28. Now I do not have time to upgrade and solve all this issues - I only need to roll back entire system for development with gradle 2.2.3 for API 26. I restored all source files of first broken project from backup. The build.gradle in it file contains line:  
classpath ‘com.android.tools.build:gradle:2.2.3’  
and gradle.properties has lines  
androidBuildToolsVersion=26.0.3  
androidCompileSdkVersion=26

But application build stops with error:

> FAILURE: Build failed with an exception.
> 
> - What went wrong:  
> A problem occurred configuring root project ‘android-build’.  
> Failed to notify project evaluation listener.  
> com.android.build.gradle.tasks.factory.AndroidJavaCompile.setDependencyCacheDir(Ljava/io/File;)V

This did not appear when I worked before with gradle 2.2.3. Something changed while gradle 3.x installation but I do not know what. Please help me find what I should restore or remove. I must ASAP return to API 26 to make important changes in currently developed new project.