Can you post the command that you're typing in to import the file?
I note from the previous post you made:
"title": {
"eng": "."
},
Which would indicate that you've not provided the absolute path to the imported file.
As I mentioned in a previous post, your commandline should look like:
tvhimport.sh /home/hts/recordings/friends/friends.mkv
The script was written to fix a specific problem I had, and for more general use, I could add a parameter to explicitly add the title. Nevertheless, you do have to tell TVH exactly where the file is. You must use an absolute path [i.e. with a / at the start] that points to the file you're importing.