Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 7e921928cfe93c104f2755101e72603bf4bea0108d15b42e3c2ecd2f797bcc57:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^