Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 9ca9724dd2f4b0fa59873e4c3f3316d03a8514c9b69fc6d63b3e17dcb9e24738:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^