What causes Snowflake UDF Language Not Supported?

Java or Scala UDF called on a Virtual Warehouse that is not on a Snowpark-compatible runtime. Python UDF requiring Anaconda package access but the Anaconda terms have not been accepted for the account. WASM (JavaScript) UDF exceeding the allowed execution timeout. UDF referencing an external network location (EXTERNAL ACCESS INTEGRATION) that has not been configured. UDF using a third-party Python package not in the Snowflake Anaconda channel

How do I fix Snowflake UDF Language Not Supported?

For Python UDFs, accept the Anaconda terms of service: `ALTER ACCOUNT SET PACKAGES_POLICY = ANACONDA_ONLY` and confirm via the Snowflake admin UI. Verify the UDF handler and language: `DESCRIBE FUNCTION (arg_types)`. For UDFs needing external packages, create an EXTERNAL ACCESS INTEGRATION and attach it to the UDF. Check that the Snowflake warehouse size supports Snowpark workloads (X-Small may be too small for Java/Scala UDFs with large payloads). Review Snowflake release notes for runtime changes that may have deprecated the UDF language version

Medium severityquery

Power BI Refresh Error:
Snowflake UDF Language Not Supported

What does this error mean?

A User-Defined Function (UDF) or User-Defined Table Function (UDTF) was called in a context that does not support its implementation language, or the language runtime is unavailable.

Common causes

1Java or Scala UDF called on a Virtual Warehouse that is not on a Snowpark-compatible runtime
2Python UDF requiring Anaconda package access but the Anaconda terms have not been accepted for the account
3WASM (JavaScript) UDF exceeding the allowed execution timeout
4UDF referencing an external network location (EXTERNAL ACCESS INTEGRATION) that has not been configured
5UDF using a third-party Python package not in the Snowflake Anaconda channel

How to fix it

1For Python UDFs, accept the Anaconda terms of service: `ALTER ACCOUNT SET PACKAGES_POLICY = ANACONDA_ONLY` and confirm via the Snowflake admin UI
2Verify the UDF handler and language: `DESCRIBE FUNCTION <udf>(arg_types)`
3For UDFs needing external packages, create an EXTERNAL ACCESS INTEGRATION and attach it to the UDF
4Check that the Snowflake warehouse size supports Snowpark workloads (X-Small may be too small for Java/Scala UDFs with large payloads)
5Review Snowflake release notes for runtime changes that may have deprecated the UDF language version

Frequently asked questions

How do I check if Anaconda terms have been accepted for my Snowflake account?

Run `SELECT SYSTEM$GET_SNOWFLAKE_PLATFORM_INFO()` or check Admin → Billing & Terms in the Snowsight UI. An Orgadmin or Accountadmin must accept the Anaconda terms.