Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 411e0e1998f101914c1db52dde91aaabd9f75b050070f20765a9591c83651698:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^