Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4a8db604f55436d2823ad5de2aaa725632bfa89be983aebf4926ee03a73f7f2d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^