Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1d658124403b5d201949d3abf5ec5964eb444bb4f600f653bc552543db6bf7bc:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^