Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7650c8edf020d66668e84d988cea41262959198ef3495bf05f82d669bba4ad58:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^