Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c19d36d5f24c1663ba062a57d1d0413b3bd384e97fa2eda6d6979b2fda7e6e6e:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^