Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 93aa17ca8d25ddd0b65061b73e0f98010ea2c3bf5772563a730c4a228af4e927:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^