Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> fad6ec685f417f70fea1e028a8932a61e33edd6b700301dc2c5a5f85ff1e1b42:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^