OnlyOffice: Exception TRIM() when trying load OO

🍱 Features & apps onlyoffice
1

I installed OO and DcoumentServer on a NC18 Version (on Synology NAS). The webgui now shows me the create document Icon and the documents will also be created. But always I want to open the document (with OO) a 2 errors raised:

  1. Exception: trim() expects parameter 1 to be string, bool given

  2. OCA\DocumentServer\Document\DocumentConversionException: ./x2t: /lib/libstdc++.so.6: no version information available (required by ./libgraphics.so) ./x2t: /lib/libstdc++.so.6: no version information available (required by ./libicuuc.so.58) ./x2t: /lib/libstdc++.so.6: no version information available (required by ./libicuuc.so.58) Empty sFileFrom or sFileTo

Anybody has same errors?
Regards
Daniel