update Mautic from 2.5.1 to 2.6 Error

Product Support
1

I tried to update to Mautic 2.6 from 2.5.1 and got the following error:

Code:
[SymfonyComponentDebugExceptionFatalThrowableError] Type error: Argument 1 passed to MauticCoreBundleHelperCacheHelper::__construct() must be an instance of AppKernel, instance of MauticCoreBundleFactoryMauticFactory given, called in var/www/html/mautic/app/cache/prod/appProdProjectContainer.php on line 9035

I tried to update manually with the following commands in the console:
php app/console cache:clear
php app/console mautic:update:find
php app/console mautic:update:apply
2

I tried to update to Mautic 2.6 from 2.5.1 and got the following error:

[SymfonyComponentDebugExceptionFatalThrowableError] Type error: Argument 1 passed to MauticCoreBundleHelperCacheHelper::__construct() must be an instance of AppKernel, instance of MauticCoreBundleFactoryMauticFactory given, called in var/www/html/mautic/app/cache/prod/appProdProjectContainer.php on line 9035

I tried to update manually with the following commands in the console:
php app/console cache:clear
php app/console mautic:update:find
php app/console mautic:update:apply

3

Revert back to 2.5.1 for the time being. Wait for the more stable release.

4

Ran into the same trouble. How do you revert back to 2.5.1?
from the command line?