I have suddenly started getting this error:

Creation Time Description Resource Path Location Type
error: file I/O fault.
***Non-Zero Status: makesis.exe returned with exit value = 1
file I/O fault.[C:\Symbian\9.1\S60_3rd_MR_2\epoc32\build\Symbian\Carbide\workspace\MF2K\group\_resolvedMyApplicationName_S60_3_X_v_1_0_0.pkg] MF2K line 29 C/C++ Problem

Earlier the project used to build without errors.
But suddenly this error has started coming. I have tried changing the source path from $(EPOCROOT) to the actual hard coded path of the SDK in use(S60 3rd. Ed. MR)

Please help.