Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> a8e713b0f4c50db5f74cfb23b6d86679767821ee17a54eea3074a3ccaab391e7:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^