It seems 2 units got some corrupted data, they are erroneously linked to an unknown army. You need to clear your saved game of these data and ask the host to do the same in the host file, hopefully the turn will run correctly. With data fixed in your TRN file, I was able to load your turn at least.
I'll also edit the code (for others AGE games mostly) so that this kind of error is dealt with in a better way.
You need to use an efficient text editor, like notepad++ (freeware) to open the TRN. Double click on the .TRN file you have and when Windows asks you about which software to use, choose notepad++ executable. Same for the HST file when the host will edit the file.
Then search for '1004137', this is the reference to the first bugged unit. You should see some line below these lines
Change the L to NULL.
Now search for '1003998'. Some lines below, you get:
change the 0 to NULL, change the -1 to NULL.
Save, quit, load your game