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Using Jamroom
I've fixed it on mine, but not exactly sure what the key to it was.
Try this,
* delete your php_error_log
Then see if this location will open:
* yoursite.com/core/integrity_check
If it does open check all the checkboxes and run the integrity check. If it doesnt open, check to see if your php_error_log has been recreated and the errors that are in it.
I suspect the error will probably be the same as before:
"PHP Fatal error: Cannot redeclare j.........."
If thats the case, open up FTP and remove all the duplicate module locations off of the server. So if you have:
/modules/jrCore
/modules/jrCore-release-5.1.0
/modules/jrCore-release-5.1.3
That type of structure, move the older version off of the server, but save it to your pc just in case. but delete it from the server so there is only one version of any particular module existing.
eg:
/modules/jrCore
/modules/jrCore-release-5.1.3
Keep just the one with the highest number.
After that see if you can get to:
yoursite.com/core/integrity_check
As the integrity check should be able to fix everything up if we can get it to run.