"Server v1.0.24" console:
MyMiniCopter.cs (307.13): CS0162 warning: unattainable Code
MyMiniCopter.cs (337.13): CS0162 warning: unachievable code
MyMiniCopter.cs (381.20): CS0472 warning: comparison result 'ulong' with null is always 'false'
MyMiniCopter.cs (381.37): CS0162 warning: unachievable code
MyMiniCopter.cs (417.20): CS0472 warning: the result of comparing the 'ulong' value to null is always 'false'
MyMiniCopter.cs (417.37): CS0162 warning:
MyMiniCopter.cs (440.17): CS0472 warning: The result of comparing values like ' UnityEngine.Vector3' with null is always 'false'
MyMiniCopter.cs (440.35): CS0162 warning: unattainable code
MyMiniCopter.cs (493.28): CS0472 warning: the result of comparing the type of 'uint' to null is always 'false'
MyMiniCopter.cs (513.17): CS0472 warning: comparison type 'ulong' with null is always 'true'
MyMiniCopter.cs (493.39): CS0162 warning: unachievable code
MyMiniCopter.cs (35.15): CS0414 warning: private field 'oxide.plugin's.My minicopter.trigger' is assigned, but its Value never used
MyMiniCopter.cs (36.23): CS0169 warning: private field 'ox.plugins.My minicopter.hours' are never used

Those are warnings, not errors, and can be ignored.

thanks