Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 2fd02a6b42014ed8fe1a1f8bb237e173059f7e0e06cfae1661ee190d49edaa54:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^