Transaction

[Error Code: 1101] cadence runtime error Execution failed:
error: underflow
  --> 984ad2b363af06a505e2c1d89d4ac0dac41e92d0e6154db6f3f972722e493001:16:8
   |
16 |         let total: UFix64 = SwapConfig.ScaledUInt256ToUFix64(res) - 0.2
   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^