Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b9d9f73ae9b787c3901e4ffe03e94af6e7aa1e87d81fbc29750622869edad4cc:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^