Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 1082ca9d550f99f90dab1dc5ec8122946b45ef6c166fbd740a4b7cdd1b200e4b:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^