Mantis to Jira Migration - Attachements Problem

[IT-Systems]

Hello,

we tried to migrate from mantis to Jira.

Everything works fine with the issues - we see them - seems that is everything fine.

But we did not get the attachements...

ERROR - Failed to attach attachments to issue MAN-1

com.atlassian.jira.plugins.importer.SQLRuntimeException: The conversion from text to BinaryStream is unsupported.

Mantis is on Windows - Database is MSSQL and the attachements are locally stored in the filesystem