Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 5f8b57d74735b0d40933b08cf9fd4cc64cdc82a3184dc27d0c6121459ad88e4e:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^