Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 21df6cdb9a92ab5a1f4f10f0eb5b4390d0608e9068c098d7617f0baf9c542d30:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^