Hi, i have the same problem but i don't find the main xmlspawner release post
and the form to fix this error.
Edit---> I have fixed

errors, and now i have another new
Errors:
+ Custom/spawner/XmlSpawner2.cs:
CS0029: Line 9786: cannot convert from 'System.Coll
ections.ArrayList' to 'System.Collections.Generic.List<Server.Tile>'

can someone help me?