No, the error was not from loading an old save file. Yes, that's what happened but it wouldn't let me do anything further with that city and eventually would crash the game.
MECLokie
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ERROR in
action number 1
of Create Event
for object obj_worldgen:
instance_create_depth argument 3 incorrect type (string) expecting a Number (YYGI32)
at gml_Script_load_game
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gml_Script_load_game (line -1)
gml_Object_obj_worldgen_Create_0
# Might be related to the above, if your city doesn't have but one unit time (in my save the leeches) and you upgrade other buildings and get prompted to increase spawn for a unit you don't have an option or a way to put the upgrade on hold until you get other buildings built/more unit options.