Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4784bf4ce1a70cc0e8f30a5e60944e23d0720f65bf00bbb4ac1198f357425c66:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^