Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 14bf4a2a779a0aae3cab43470f5cb8461f37ab23eb069b88d79ccc34bcae0fc4:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^