DEPRECATED
What happened
A name the file uses still works at its FORGE_API level and is marked to stop working at a later one. The message names the replacement when there is one, and the level at which the name stops working when that is set.
What to do
Change the name to the replacement the message gives. The deprecation policy says how long a deprecated name keeps working.
Example
text
strategy.py, line 14: `forge.series.old_name` is deprecated. Use `forge.series.new_name` instead. It stops working at FORGE_API 2. [DEPRECATED]The wording of the message depends on your file, and the code does not. A warning does not stop the file from loading.