Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 71e7a5cf4b1cb87832c2b3c001913f46ed6b26f4e1ac1b821c35f9b7ca388fd5:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^