Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b9bff229bf5d6ba57cfb2289cd52b0edbfce93b48cce98a7a742cda969b7de0f:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^