Error in phase MAIN_SHDPREPUT/START_SHDI_PREPUT!,

Hello All,

During CRM upgrade in preprocessing in  MAIN_SHDPREPUT/START_SHDI_PREPUT!,

Upgrade stop wih:

Severe error(s) occurred in phase MAIN_SHDPREPUT/START_SHDI_PREPUT!

Last error code set: Shadow instance couldn't be started, check 'STARTSSC.LOG' and 'DEVTRACE.LOG': Process S:\SUM\abap\exe/sapcontrol.exe exited with 2, see 'S:\SUM\abap\log\SAPup.ECO' for details

Any Idea,

Thanks for any Advice

Reza