Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 02e9ba8d2307226e84e5080d156a7f2383adf4b09b100b99fc9fcaee0a8fc38d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^