Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 28dfef5d070dde8bd2529337b65206a08f36d0b8629f8ca2c210c0610b01ffa7:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^