acrobat is unable to distribute this form??

Hi

Ive been building a form over the last few weeks in LiveCycle ES2. It's nothing too complicated (text / date entry , drop downs, repeating row tables etc) - there is no validation set at all at the moment or any kind of signature.

My issue is that I am recieving an error message when I attempt to distribute the form:

"acrobat is unable to distribute this form" - that's it. No other information to help find the cause of the problem

I am using Acobat X version 10.1.4

Has anyone seen this before? Can you help me at least know where to start looking for issues please?

Thanks

Ellis