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Relationship error "invalid field definition of index or relationship"

Relationship error "invalid field definition of index or relationship"
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I have been working on a database for a few weeks and I have 7 tables now.

Client
Consultant
Project
Assignment
Job
Consultants Pay History
Invoice Slip For Client

The thing thats worrying me is I dont want to hand the database into my teacher for it to be marked and then he tells me that the relationships are wrong and I lose valuable credits.

I know you guys are busy but if I attach my database could you please take 5mins of your time to download it and have a check through the relationships to make sure the logic behind it is ok?

And if it is not to much trouble could you tell me which table to relate invoice too
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