Problme adding files to playlist

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I just added more files and now I have 7000 mp3 files. After doing Manual ad and when I select all the media files, I get the following error:
And only 4100 files are added.

We apologize for the inconvenience, but an internal error has occurred.  Please try again later.

Details: Warning: Missing argument 3 for RPClibrary::api_get_albums() in /usr/local/centovacast/web/client/rpc/class_RPClibrary.php on line 166 (php)

Anybody can help, much appreciated.
Thanks