I have an issue with the list template on Sharepoint Foundation 2013. I've downloaded list as a template from SP 2007 (calendar is my template list in this situation). Done everything with .stp, .cab and back to .stp files and uploaded it to SPF2013 List templates. All is fine here. THE ISSUE: I'm trying to add an app using that template and after a while trying to add it, SPF2013 throws me an error message "Unexpected error". The error message itself is blank - SPF2013 help window doesn't give me any info. The only reason that I can think of for this to happen - there are more than 1000 entries in the calendar. However, I was able to import couple of calendars with more than 1000 entries no problem, it just suddenly stopped doing that for the next ones. My question is - does anyone know why the error occurs and the app can't be added based on the template? Is it due to the amount of the entries?