Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7c9a677bdacb2b51639c8f6cc718d086b020b75e489850165e56d5909352cd8b:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^