An error has occurred. 1176 Key 'idx_items_common_backend' doesn't exist in table 'i'

[bluetoothbeijing]

There is a error tip after updated to newest version [v2.12 (rolling release) / Jun 20, 2025]
An error has occurred.
1176 Key 'idx_items_common_backend' doesn't exist in table 'i'

[fevangelou]

Try re-installing.

If you get an error again, check your database tables (e.g. via phpMyAdmin) and tell me if those for #__k2_items & #__k2_tags use the MyISAM engine (it should show in the list of all tables).

[bluetoothbeijing]

If my upgrade procedure is right? (wrong refer link)
1.Download K2-master.zip from https://getk2.org/downloads/?f=K2_Rolling_Release.zip.
2.Uploaded files to website overwitten all old files.

[bluetoothbeijing]

I rewitten the website using files June 20.Error again.But I rewitten the website using files last time download on May 12.It is OK.

[bluetoothbeijing]

I rewitten the website using files June 20.Error again.But I rewitten the website using files last time download on May 12.It is OK.