1. Check the server.log in debug mode listing all the file objects parsed until to find the wrong file.
<fileentry>
<fileName>éœ.xnv</fileName> <--- check this name
<filePath>2</filePath>
<fileSize>7815</fileSize>
</fileentry>
</list>
2. Verify on the file serves location the file exists
3. Rename it to a correct name
