Internal Server Error when trying to batch add files

[LuthienMoss]

batch adding has always been working for me, but now I created an album, and uploaded over 1000 pictures, which i wanted to batch add, and got this error.

Internal Server Error
The server ecountered an internal error or misconfiguration and was unable to complete your request.
Please contact the server administrator and inform them of the time the error occurred, and anything you might have done that may have caused the error.
More information about this error may be available in the server error log.
Apache/2.0.55 (Red Hat) Server at x Port 80

I don't know what a server error log is ... What should I do ? 

[Joachim Müller]

You're overloading the server. Upload less files in one go, preferably split those 1000 files into sub-folders. If this doesn't help, take a look at the mass import plugin.
For details, the same recommendation that supporters reply to all threads on this board applies to you as well: do exactly as suggested in the upload troubleshooting section of the docs if you want support on uploading issues.