Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 108fce3f1e62a3240a5d5d4b6de8f1322bf54a5b6802ffe49e7ed42718fe3769:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^