Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> cf9c4026b4b3e222c3759aaaf387f4bc77ac9f4163bbb68f13ef2ea36b50cd78:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^