SSRS Reports are not working in AX 2012R2 or Report server crashes in AX 2012 R2

When ever we face such kind of a problem we need to delete XPPIL files from the Bin folder except folders which is availble in the Bin folder.

so that we can fix the problem as well as we have to generate the Full CIL.
      
DynamicsAx2012\Ax6.0\msdax\server\bin\xppil(except folders delete all files), for our security take all the backup before any action.