Label not found error on desktop during battle

[City Builder]

I'm just grasping at air in guess, but does your character have that piece of parchment that allows them to get awards and extra gold after every battle in her inventory instead of on her character? Or maybe you haven't gotten that piece of parchment at all?

When I received that error message I clicked one of the buttons and it ended the game, since I put that piece of parchment on my character instead of leaving it in her inventory it hasn't happened again.

It could be complete coincidence however (and likely is) but I'm now curious if the parchment is in your inventory or on your character or not at all yet received.