There are also several occasions where data types are slightly different and would cause things to fail. date fields in particular.
If the migration assistant Perry pointed out doesn't help - try using SSIS to pull the data in, rather than using the upsizing wizard to push the data over. You should at least get some better error messages
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Your lack of planning does not constitute an emergency on my part...unless you're my manager...or a director and above...or a really loud-spoken end-user..All right - what was my emergency again?