Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> e9db3519f3d2e7b650d012d2820ed4cb60bc5f896fa15fb7cfb50b94c6fa53e4:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^