Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 3f3a75baf481b2396f51d97e97946ebbec231d661c40dcf25478dc8741d01c9e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^