Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> fbce7db9e588d91dc64378f292f3dab17fce4ac66d6dfb2fc033237c41a92a75:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^