Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> f650eaf4433fe195320c65b326a46a99d72553c0988d6d2092c443a3100af276:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^