Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 0434fbc8af4b4fe5ff6b2e45695d74180455b0fba0d6c5f91bcddf2d9c545d6c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^