Hi: I had exactly the same error … “failed to open stream: No such file or directory /MySite/concrete/libraries/loader.php on line 277”
During a migration, for any unknown reason, the loader.php file among others failed to upload to the libraries directory.

Then, I uploaded the entire libraries directory again, and issue was fixed.

Always use filezilla to upload; did not receive any upload fail error; never had this before in more than 100 sites migrations with filezilla and won’t dare to blame it.

Using C5 version 5.4.2.2.

Hope this helps.

Hi! I am having the issue you note above:

Warning: require(/home/m1schuld/elkhartcountyhistory.org/updates/concrete5.4.2.2/concrete/dispatcher.php) [function.require]: failed to open stream: No such file or directory in /home/m1schuld/elkhartcountyhistory.org/concrete/startup/updated_core_check.php on line 6

Fatal error: require() [function.require]: Failed opening required '/home/m1schuld/elkhartcountyhistory.org/updates/concrete5.4.2.2/concrete/dispatcher.php' (include_path='.:/usr/local/lib/php:/usr/local/php5/lib/pear') in /home/m1schuld/elkhartcountyhistory.org/concrete/startup/updated_core_check.php on line 6

Could you explain your process in a bit more detail? I am a bit of a novice. Thanks!

I will try to upload the entire concrete5.4.2.2 update directory again, and see if this fixes the issue.

Hope this helps.