Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6a15b1f390dacd692ced4a59edae09eed09661b844ffae8ce0ccb932f0df20a3:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^