Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7e26099068b6d70e09553e1d9d4258822c521d96b86b18f79403421737d73557:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^