Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6eaa4de107ef8fc0e1131526e05a6408fa05f6d866af741a8ac610c3ceaf3d55:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^