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Fatal error: Uncaught Error: Class 'Q2A_Plugin_PluginManager' not found in /storage/ssd3/173/19637173/public_html/qs/qa-include/qa-base.php:387 Stack trace: #0 /storage/ssd3/173/19637173/public_html/qs/qa-include/qa-base.php(66): qa_initialize_predb_plugins() #1 /storage/ssd3/173/19637173/public_html/qs/qa-include/qa-index.php(46): require('/storage/ssd3/1...') #2 /storage/ssd3/173/19637173/public_html/qs/index.php(27): require('/storage/ssd3/1...') #3 {main} thrown in /storage/ssd3/173/19637173/public_html/qs/qa-include/qa-base.php on line 387

I got this error, idk what is causing it, at my localhost I don't face it

Anyone got an idea?

Plz help me at least debug it?
The class is defined in the file $QA_BASE_DIR/qa-include/Q2A/Plugin/PluginManager.php. In your case that would be /storage/ssd3/173/19637173/public_html/qs/qa-include/Q2A/Plugin/PluginManager.php. The file is part of the Q2A base install. If it's missing from your installation you need to investigate why that is and/or restore it from the install archive. If the file is present but still cannot be found it could be a permissions issue or a problem with the PHP include_path. Your webserver error log should provide more information.

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It seems reuploading the whole script solve the problem!