If you see this message, you'll have to upgrade Jon's tent. Just click on the tent and use lasagnas to purchase an upgrade. 

Each tent has a different production limit:

• Pup tent (level 1) = 10
• Ridge tent (level 2) = 20
• Wedge tent (level 3) = 30
• Dome tent (level 4) = 45
• 4-Season tent (level 5) = 60
• Cabin (level 6) = 100
• House (level 7) = 200

W e recently changed the production limits, so if you were at a higher limit before the change you might see something like "Production Limit = 41/20".