I have an EE 2.11.9 with only CE Image, Freeform, Stash, Deeploy Helper als Add-Ons that I want to Upgrade to EE 3.5.17.
I went forth and back several times, I even moved the site to a developer server as a copy where the same happens:
The site itself runs, but after typing the login information for the CP I get a Internal server error 500 on this template: /cp/login/authenticate.
The hosting provider has no clue nor have I one. I have checked a dozen of times and have had an EE fellow controlling if I was doing something wrong.
Can someone guide me into a direction where I might find a solution to this? I have spent now almost 2 days with this trouble.
Thank you.
Edit:
After setting debug to 1 in admin.php I get this error messages:
Notice
Trying to get property of non-object
ee/legacy/libraries/Session.php, line 369 hide details
Severity: E_NOTICE
Notice
Trying to get property of non-object
ee/legacy/libraries/Session.php, line 369 show details
Severity: E_NOTICE
Notice
Trying to get property of non-object
ee/legacy/libraries/Session.php, line 378 show details
Severity: E_NOTICE
Notice
Trying to get property of non-object
ee/legacy/libraries/Session.php, line 401 show details
Severity: E_NOTICE
Fatal error: Call to a member function getId() on null in /home/octave2d/public_html/_wernergusset/expconsole/ee/legacy/libraries/Session.php on line 401
Does this lead to some insights?
superadmin
account natively right before the upgrade run, and use that after. Then solve your member records inconsistencies in the database.