Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 735ce14e78ff2cac1258afa54ebf6a7ab0ee512dab800a9f5bbcbc060aa1f89e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^