Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 6be92df7634bd9155442b5c0e2ad47de8bd3a914f0f9f8d6134254c9cd077171:16:32
   |
16 |                                 let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^