Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 98f216db82d6f194d62e4b809289b3fe5d0cea2c4f37a1b91e84784d6c117a31:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^