Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4f722afd8e5b36b5b7357f3700dd25ba3878c90db3a12893d2397863e38c3bbf:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^