Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4f3bdecb5c7bb11b332e9c081340e5cfa764a3c6fd8f51163a1c8ad54b5d6594:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^