Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> cf8247fceb1476a2aa3ac9ca587d9e5309de89774cb62f0c4b1d4b9a42c4c664:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^