Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 85ef3b440545a7a3a2d2fab2479596c59daa28beacfaf0d22612e6f0621ccd90:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^