Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> e34da76f4962c20579ea04ecbb577d615a7b4bc0b5d04a61f9174170aeffba19:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^