Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 41a0ad7e8d782ca4cd13c8facfa145d63224d878ad19ed513b20ef3c8cbeb04a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^