Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> b81208bba1d1a31c72a395eb99a026d858b109b545a1ac8f2d1134d036fc56cd:15:8
   |
15 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^