Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> fd16f75dff9b8dddfa36c5ae43f84a3e0cb99ddeb2c49639a520e34527b17bd4:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^