How to fix Error 2235 on Windows Server 2025 / Windows 11

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Troubleshooting Guide: SQL Server Error 2235

Why This Error Happens

Error 2235 (“An argument list was applied to a non-function term”) typically occurs when SQL Server parses a T-SQL statement, stored procedure, or application-generated query that incorrectly attaches a parenthesized argument list to an identifier that is not a scalar function — such as a table name, variable, or keyword. This is commonly triggered by corrupted or improperly migrated stored procedures, outdated client drivers misinterpreting syntax, or a naming collision where a user-defined object shares a name with a reserved keyword or system function. In Microsoft SQL Server 2025 running on Windows Server 2025 or Windows 11, this can also surface after in-place upgrades where deprecated syntax from older compatibility levels is no longer silently tolerated by the new query parser.

Step-by-Step Resolution Guide

Step 1: Identify the Offending Query or Object

  • Open SQL Server Management Studio (SSMS) and check the Activity Monitor or SQL Server Error Log (C:\Program Files\Microsoft SQL Server\MSSQL17.MSSQLSERVER\MSSQL\Log\ERRORLOG) for the exact statement that triggered Error 2235.
  • Use sys.dm_exec_query_stats combined with sys.dm_exec_sql_text to extract the exact failing query text:
  SELECT st.text, qs.last_execution_time 
  FROM sys.dm_exec_query_stats qs
  CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) st
  WHERE st.text LIKE '%(%'
  ORDER BY qs.last_execution_time DESC;

Step 2: Inspect and Correct the Syntax

  • Look specifically for a non-function identifier (table, variable, or keyword) immediately followed by (...).
  • Common culprit: a missing EXEC keyword before a stored procedure call, e.g., MyProcedure(@Param1) instead of EXEC MyProcedure @Param1.
  • Check for naming collisions by running:
  SELECT name, type_desc FROM sys.objects WHERE name = 'YourSuspectName';
  • Rename the object or escape it properly using square brackets, e.g., [MyTable], if it conflicts with a reserved word.

Step 3: Validate Database Compatibility Level

  • Confirm the database compatibility level matches SQL Server 2025 expectations:
  SELECT name, compatibility_level FROM sys.databases WHERE name = 'YourDatabase';
  • If the database was upgraded from an older version (e.g., SQL Server 2016/2019), update it explicitly:
  ALTER DATABASE YourDatabase SET COMPATIBILITY_LEVEL = 170;
  • Recompile all affected stored procedures using sp_recompile 'YourProcedureName'.

Step 4: Rebuild or Restore Corrupted Procedures

  • If the procedure definition appears corrupted (e.g., stripped parentheses, broken CREATE PROCEDURE syntax), drop and recreate it from a known-good source control version or backup script.
  • Use DBCC CHECKDB('YourDatabase') WITH NO_INFOMSGS, ALL_ERRORMSGS; to rule out underlying page-level corruption affecting stored object metadata.

Alternative or Verification Steps

  • Re-run the originally failing query or application workflow and confirm Error 2235 no longer appears in the SQL Server Error Log or Windows Event Viewer (Application log, source: MSSQLSERVER).
  • As an alternative, if the error stems from a third-party application or ORM-generated query, update the client driver (e.g., ODBC Driver 19/20 for SQL Server or Microsoft.Data.SqlClient) to the latest version compatible with SQL Server 2025, since older drivers may generate malformed parameterized calls.