Seaquel
SQL Server error code

SQL Server error 1222

SQL Server raises error 1222 at severity 16, which marks a problem with the query or data that you can correct.

Lock request time out period exceeded.
Msg1222
NameLK_TIMEOUT
Severity16
Group1000–1999

What it means

Another transaction held a lock on a required resource longer than this query could wait for it.

Source: Database Engine events and errors