Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> eb28d315d71a965c445fe2e7aa39e73f09e04d4d3392d50596a72bd7ddf4c587:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^