while creating an incremental backup I received the following error.

Notice: Undefined index: different in C:\projects\VLE\Mobile Moodle\environments\xampplite-win32-1.6.6.exe\development\offlinemoodle-0.3\htdocs\moodle\lib\xdelta.class.php on line 284

Notice: Undefined index: different in C:\projects\VLE\Mobile Moodle\environments\xampplite-win32-1.6.6.exe\development\offlinemoodle-0.3\htdocs\moodle\lib\xdelta.class.php on line 81

Warning: rmdir(/tmp/a2dd617ad6a828f54e060ea0bf210033/files) [function.rmdir]: Permission denied in C:\projects\VLE\Mobile Moodle\environments\xampplite-win32-1.6.6.exe\development\offlinemoodle-0.3\htdocs\moodle\lib\xdelta.class.php on line 310

Warning: rmdir(/tmp/a2dd617ad6a828f54e060ea0bf210033) [function.rmdir]: Directory not empty in C:\projects\VLE\Mobile Moodle\environments\xampplite-win32-1.6.6.exe\development\offlinemoodle-0.3\htdocs\moodle\lib\xdelta.class.php on line 310

The inability to delete the files folder ensure the failure to delete it's containing folder. this could be due to permissions. If so this should be rectified by creating the temp folder in the moodledata folder as defined by bug CONTRIB-401