How to migrate MS access database to Oracle?

I am using SQL developer, but while capturing Models step executes, it gives me following error

oracle.xml.parser.v2.XMLError.flushErrors1(XMLError.ja开发者_如何学运维va:323)

Can anyone either tell me how to fix this issue or help in with an alternate way to migrate the database.

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I used same tool but removed selected option of not copying the constraints and copy only tables structures and data. This fixed the issue.