Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 73ee30ff6179df8d51a53fbaf6ae9d3668c6eebbc2864c3980332bf19e38ced3:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^