Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7793d2ecdba1e018bec51e4a27b9f663f7736020f40e193d54b3a3f7511341fb:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^