Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> bb905cb65370ef8ee0a90aeb07dedafc481f42de89eab076e8e199deb97714a2:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^