Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0ce9c8c426613ce9eafb9ccece47d82e7689eb28429c906c9d4574e0013029f5:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^