Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> a7811110ca61bbf7e4972e5a172b1652eade3ffee47145e94638cb6ca674b15e:16:32
   |
16 |                                 let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^