Seaquel
SQL Server error code

SQL Server error 4070

SQL Server raises error 4070 at severity 16, which marks a problem with the query or data that you can correct.

More than 255 columns were specified in the COMPUTE clause, and this metadata cannot be sent to a SQL Server version 6.5 client.
Msg4070
Severity16
Group4000–4999

Source: Database Engine events and errors