Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> dabefe211083298fbb9cae8e1d2096cf59e2c8072a7a4464fe4539dab4fd292d:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^