Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 2d8082a32b914cee90aea42986e8a6cfca5cf38e02f03b0cf03fa5c442f0d9ed:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^