Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c9d5e1a442518005db268fd636d2ac5bfc6d954778e3a1ec564f5cc1095519e0:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^