Kolab 16 - "internal Error" in roundcube mail while "idling"

[kolab]

Hello everyone,

we're using Kolab 16 installed on Cent OS 7.
Everything seems to work well except the roundcube mail.

I can successfully log on into roundcube mail, send and receive messages.
The strange thing is the message "internal error" which appears periodically.
After a while it disappears only to appear again in 1 minute.

I've checked the log files of apache (/var/log/httpd) and the roundcubemail logfile.
But I am not able to find an error entry there.

Can somebody help and tell me what to do in this case?


Best regards,
Juri Glukowski


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