Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> fff4b4d0ac52585e2e853ea99244efdd0e046ab2d30a400ae1f1cea61d951a40:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^