Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> c6e999eddf8f897bf436a056fa4bc557ad79ce0f531a1dc70ebc396200226b8d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^