It's possible that the line:
# - Adjacencies Throttled for Glean
before the ARP table is displayed is causing CatTools to think that it has reached the 'anchor-point' (i.e. the device hostname prompt being #), so ignores the rest of the data and therefore can't find any ARP table header row.
Does your device have a hostname (e.g. 'nexus#' or 'abc123#'), or is the enable mode hostname prompt simply just the '#' character? If the latter than this is most likely the problem. Configure a hostname for the device and you may get it working.
If this isn't the issue, I'd recommend raising a support ticket as we'd need to get some device logs from you to analyze.
Under the options tab > use alternate command, I typed the following command to use: show ip arp | exclude #
The results of this command show the same results as previously mentioned without the line containing #-Adjacencies...
The report still fails with the same errors.
I think I have resolved my problem. When I upgraded to the latest version of KIWI CatTools, I failed to update the device types to "Cisco.NXOS," which was not a device type option prior to the upgrade. Once I did this, I was able to get the ARP table report to run and appear to finish.