There are certain characters in the name of the file that your operating system does not allow.

Previously there weren't many clients sending any special chars but since that has changed you are likely to see those errors. The next version that is probably going to be released next week, should fix this.

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Morgens ess ich Cornflakes und abends ess ich Brot
Und wenn ich lang genug gelebt hab, dann sterb ich und bin tot

--Fischmob