Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 74b56d5c9f726ba48a086423e12a1337c7f22e63c88b4b107e96c12a9cfe7cca:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^