Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d237b4900c6e6781a29f74c2f5f962ba93e2472b2c6795f1045f4647ba5c326b:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^