Hi
Thanks for contacting us and sorry for your issue. This issue occurs when a language file is missing in the language folder. You have to check it from the path below:
Helix Ultimate folder --> Templates --> Shaper-Helix-Ultimate --> and open TemplateDetails.xml file
Check the language tag. It should be the same name in the template details file language tag and language folder file name.
If that language file is missing then you have to take it from the helix folder to here. Hope you understand.
-Regards.