Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 94e97b86e19ff352b09147fd95fa7e60fbaa970fb1e80b8ca17c3607a3f4dc7a:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^