Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b992effbfa3a7fa78298767cc7c01cc27c17bfca4fc1221bc77e58663851b9e9:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^