Error upgrading to 8.1 from 5.7.5.13

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Hi guys,

I've been trying to upgrade my concrete5 installation from 5.7.5.13 to 8.1 but on every upgrade attempt I get the following error:

An exception occurred while executing 'DROP INDEX akid ON FileAttributeValues': SQLSTATE[HY000]: General error: 1025 Error on rename of './Concrete5_kraztech/#sql-680_1a9' to './Concrete5_kraztech/FileAttributeValues' (errno: 150)


Any thoughts or suggestions?

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