Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6f1c0a3b4b84184f5dc8e30eadc035fc6875bc0cfb09b63bdb895611088a6bc2:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^