Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> aa811dc3d77c203d2323cf9e5113ccf2eeab807889b0b1b9dfa8349de5a906df:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^