Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 964515dc8bd5eba68e4f2fb21d755baa552159f1f802abf7fdc7dd5cdcbbb307:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^