Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c0dfbe19210c93bc44dfb5a69f6d1df0f5dfdda9ce2a6fb4285f65edccae8129:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^