What should I do? I know it's pretty easy for you. Help, Newbie :(

Question

Notice: Undefined variable: parentid in C:\xampp\htdocs\ERMS\Admin\function.php on line 238

Answer 1

Well, that error message is telling You, that there is undefined variable in file located in directory, on shown line. You should open this file with some ide editor (notepad++ will surely work ), and check if there is any assignment made to this variable (parentid), if Your syntax is right (Used =, use one kind of parentheses inside of another and end statement with semicolon ).
If You can't figure it out please paste like 2 lines of code before and few after stated line.