Summary: Huge block of errors appears. Errors keep coming and won’t stop, making it impossible to close. This meant that I couldn’t play the game. The screenshot shows only ~400 errors, but I eventually had more than 3000!
Possible (?) causes: This happened immediately after I clicked the sword button (not the call to arms, but the one that opens the menu with call to arms on it). Other things I had recently done include: starting a building, and removing a trapper area.
Notes: when I clicked on the green “harvest” button I was able to close the error window, but when I right-clicked to stop harvesting it came back again.
Please note that the errors before error 19 were not part of the same incident.