Error when run EXEC procedure in T-SQL Statement Task

I created few procedures that I want to run using Maintenance Plan's Execute T-SQL Statement Task box however I'm getting error that job is not found.

Maintenance Task's configuration:

Returned error for running EXEC [dbo].[sp_backup_full] N'db_name', N'path/where//to/store/backup':

End Progress Error: 2021-06-29 18:59:00.42 Code: 0xC002F210 Source: full_backup_and_delete_old_one Execute SQL Task
Description: Executing the query "EXEC [dbo].[sp_backup_full] N'db_name..." failed with the following error: "Could not find stored procedure 'dbo.sp_backup_full'.".
Possible failure reasons: Problems with the query, "ResultSet" property not set correctly, parameters not set correctly, or connection not established correctly.

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