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[Dima]

Hello!

Yesterday, i was workin in my gallery (ladygaga.ru/gallery) and everything was fine, today there is an error "Critical Error. An error occurred while accessing the database". Why? How can i fix this?

[gmc]

Your gallery appears to be working - so I assume you found/fixed the issue...
For 'next time' - follow the instructions here to enable debug:
http://documentation.coppermine-gallery.net/en/errors.htm#errors_fatal

With debug on - CPG provides more detailed error messages that will point you to the issue.  Table needing repair is an example that can result in this - but let the message guide you.
The above instructions include how to turn on debug manually (outside of CPG dialogs) - as the dialog may not be available to you as result of the error.