Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 5e647343e5b0b0b79e9d237613b6bea758ab302144490a71f4cb46c3a63a93dc:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^