JSAPI: Add explicit error message if method not found
JSAPI: Add explicit error message if method not found

faint32/snowflake-1,SnowflakePowered/snowflake,faint32/snowflake-1,SnowflakePowered/snowflake,RonnChyran/snowflake,SnowflakePowered/snowflake,faint32/snowflake-1,RonnChyran/snowflake,RonnChyran/snowflake