Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 75edb26450cf26ec8e3f2bd4182ccc52d90a37f4cd4181a4ac62f7871f1bb75b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^