Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 8a87b2559aaa7451fd864b91a52f244f5881e9ecb945da07650a56c3eb3b1565:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^