Error Loading Catalog File

Hi All,
I get the following error when I try to run a model from catalog:
“Error loading Catalog
C:\…\AppData\Local\Temp\CitB8A4.tmp due to Error reading Catalog file”

Has anyone seen this before? what can be the reason?
The catalog file should be fine since a friend of mine can run it on another machine supposedly.
Thanks

Is this the full error message you’re getting? Does it not mention specific file(s)?

Were you able to run it before but then at some point you started getting this error?

the full error continues with similar lines “Error reading catalog file” and “unable to load application”.
it only mentions the “CitB8A4.tmp”
I never ran this model before, it is the first time.