Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> a91d735d2d564f8b2f83580f6bca6bf8f4fbd2cfea7a2fa2bead0b932257b1c7:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^