[Therion] Help with an error

[Bruce Mutton]

> I do have a warning but I always get this on this particular Win 10 machine. It's a windows thing I think, I just ignore it.
> warning -- can't open cavern log file for input

This just means that you do not have survex loaded on the machine that Therion is running on.

If you do, and Therion is set to use survex loop closure, you will get instead a section in therion.log that starts like this;

####################### cavern log file ########################
 1> Survex 1.2.37
 2> Copyright ¸ 1990-2018 Olly Betts
 3> 
 4> Survey contains 140 survey stations, joined by 139 legs.

etc

Bruce