Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4b49001f3c67f03952a2875dfe2e0829222ea9fb52d7f4f0daf13ca422996f63:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^