Error message when flashing (some changes failed)??? topic

Question Error message (some changes failed)???
when i try to change and flash another ROM i get this message... set_metadata_recursive: some changes failed
Error in /external . sd ( has name of whatever rom im flashing here)
( status 7 )
Installation Failed.

what my setup is... Rom - m.o.a.r.
Kernel - Domination 747
Firmware - UVDMD5


I tried to flash PacMan 4.3. rom and beanstalk 4.4

and i also get a error message when trying to wipe dalvic cache and it says something like ... path (sd/ext) unknown or no file
Dalvic cache wiped


Please help...thanks in advance...