Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b2b7a0e0a5edfeaf063d2f0b2b2e194efc5e9be1c30c648bd709f320788f2195:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^