overcome error in File.Writeline

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C#

I am using the below code to compare two files and finally write the file . The error is like below
;-
the best overloaded method match for file.writealllines(string,string[]) has some invalid arguments.

my code is :-


var result = File.ReadAllLines(savePath).Except(File.ReadAllLines(todaytraffic));

File.WriteAllLines(todaytraffic, result);