'DataHandler' already contains a definition for 'instance'

please help me to solve this problem on my unity, I have tried but no result.

my DataHandler class

the error message

>Solution :

You named 2 variables "instance". Rename one.

edit:
your code shows:

private static DataHandler instance;
public static DataHandler instance;

my suggestion would be to either remove one of them (cause I don’t think this makes any sense) or to rename one:

private static DataHandler _instance;
public static DataHandler instance;