Since upgrade to 0.3.2, I run a diff on one switch successfully. When I select a different switch and run a diff in the same window, I get this error. The only workaround is to click Dashboard, Devices, et. al. then navigate back to Backups. Refresh does not work.
To replicate:
1) Navigate to Backup
2) Select deviceA
3) Run a diff
4) Select deviceB
5) Run a diff
Error
This did not happen on v 0.3.1
Primary browser Chrome Version 57.0.2987.133 (64-bit), but tested on IE, and FireFox.
[Fixed in 0.3.3] Warning: Only two backups can be diff.
We fixed this internally just earlier today 
https://tracker.unimus.net/browse/UN-166
Fix will be released in 0.3.3.
Thanks!

https://tracker.unimus.net/browse/UN-166
Fix will be released in 0.3.3.
Thanks!