Schnapps Export Error

Is it possible to find why my schnapps export fails? It always create file ~150MB and then says “Snapshot export failed!” without any reason why …
is there any other option in that command? or do I use it wrongly?

schnapps export 217 /tmp/run/mountd/sde1/Extend/schnapps/

schnapps export fails

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./srv/mysql/performance_schema/db.opt
./srv/mysql/.version
./srv/mysql/ib_buffer_pool
./init
Snapshot export failed!
root@turris:/tmp/run/mountd/sde1/Extend/schnapps#