Let me try to explain. It's kind of hard to get the logic of all of this at first.
here's an event for the Communist Chinese that I copied out of the "gameplay" folder.
###############################################################################
# Communist Chinese Events
# Event ID Range 240000 - 249999
###############################################################################
# Event list
# (id) (event name) (author) (status)
# 240000 Emissaries from Zhang JRaup integrated
# 240001 Message from Moscow JRaup integrated
# 240002 Loss of the Xi'an Emmisaries JRaup integrated
# 240003 The United Front JRaup integrated
# 240004 Full Mobilisation Steel integrated
###############################################################################
###############################################################################
# Emissaries from Zhang
# Event 240000
# CORE2 Ver 0.03
# by JRaup
###############################################################################
event = {
id = 240000
random = no
country = CHC
name = "EN240000"
desc = "ED240000"
style = 0
So -- what does this tell you?
First, if you want to know what the in-game name of this event is, you note the name listed above (name = "EN240000") and then go to the file event_text.csv, which is an excel file (in the "config" folder) and scroll down to the appropriate line, which reads: "EN240000;Emissaries from Zhang;;;;;;;;;;x"
Then, if you want to see what the in-game text of the game is supposed to be, use the next label above (desc = "ED240000"), which turns out to be the very next line in the same event_text.csv file. This begins as follows, but has a great deal more text in the following cells:
ED240000;Envoys from the camp of Zhang Xueliang . . .
Now, if the formatting of these references is screwed up somehow, for example if quotation marks are not closed or if the line numbers above refer to non-existent numbers in the event_text file, then you get the error message UNKNOWN STRING. It's not an execution bug so much as a database mismatch.
Hope this helps.
*************
By the way, baylox -- what an amazing resource that event list in your sig is! Did you make that yourself? Wow . . .