Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> d0e998c21e7a0ddb6f99d0c0086d11f11c8a1acb9a0889746ce013bf77329e2f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^