Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f473a4f97e8b1245fe89db9e3c5ae1e0f052f2eb2573ad1024423a2ace7606ca:16:28
   |
16 |                             let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^