Did this just start happening? A similar issue arose from a client issue a little over a month ago, and was resolved with a new client update.
I am actually very new to Runemate (was running on my own simba-based scripts) and I have no prior experience with the client. The issue occurred the first time I ran this bot (about a week ago) and upon trying again today, the same issue reoccurred.
I'll let you know if anything changes in the next update.