Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b6be4195a6267e5a3e9232aa646a268f803eba215836bf3f47db1d4ead0c6225:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^