Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 71650b1e59640ba23dfed2ee3fcdab16864fcc14df1a74c6f14cbd4337d0b7b1:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^