I am having trouble with getting rid of the error Cannot resolve symbol 'R'. I have done some research but none has worked. Among the tips i have tried out include **Tools->Android->Sync Project with Gradle Files** after which I executed the **Build->Clean Project**. The clean project command resulted with the following error;

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> Execution failed for task ':app:mergeDebugResources'. > Crunching Cruncher abc\_btn\_radio\_to\_on\_mtrl\_000.png failed
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My xml files have the following error:

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> NOTE: This project contains Java compilation errors, which can cause rendering failures for custom views. Fix compilation problems first
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> Exception raised during rendering: action\_bar
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What might I be missing? I will appreciate any help or pointers.