migrate all accounts into contacts in MS CRM

Hello All,

I have to migrate all accounts into contacts in MS CRM with all relationship references like activity,notes,opportunity,case......etc. found in account entity.

For that,I am using SCRIBE, but when I tried got an error.

ERROR: SQL time-out expired.

but when i tried to do same migration on different environment (Development - Account entity TO  Testing - contact entity).Its done,but when using same thing with in a development environment it stuck.

Anyone having any idea,why error coming.