Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 4916bc835f72ce48be90d1294450927bd169459ef15555e3706df6eafc00d0e4:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^