Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 80b8b9752c50cfebf42c922ee1a742ac28a889d464c236940f163c0aa9e2dc0c:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^