Solved: error: not all code paths return a value

Hi all,
I'm getting this error for the below program, can anyone figure where is the issue?
error CS0161: 'AbstractSyntax.Parser.type()': not all code paths return a value

in my parser.cs:

 private Type type() <-- error
        {
            Type t = null;
            switch (current_token.getType())
            {
                case Token.TokenType.Int:
                case Token.TokenType.Char:
                case Token.TokenType.Float:
                case Token.TokenType.Bool:
                    t = new Type(current_token.toString());
                    current_token = mylexer.next();
                    return t;
                default:
                    Console.WriteLine("Syntax error: line " + mylexer.getCurrentLine() + " expecting: int, char, bool, or float" + "; saw: " + current_token.getType() + "value is " + current_token.toString());
                    current_token = mylexer.next();
                    error_flag = true;
                    break;
            }
        }

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in my abstractsyntax.cs:

public class Type
    {
        readonly static String INTEGER = "int";
        readonly static String BOOLEAN = "bool";
        readonly static String FLOAT = "float";
        readonly static String CHAR = "char";
        String id;

        public Type(String t)
        {
            id = t;
        }

        public bool isInt()
        {
            return id.Equals(INTEGER);
        }

        public bool isBool()
        {
            return id.Equals(BOOLEAN);
        }

        public bool isFloat()
        {
            return id.Equals(FLOAT);
        }

        public bool isChar()
        {
            return id.Equals(CHAR);
        }

        public String toString()
        {
            return toStringIndented("");
        }

        public String toStringIndented(String indent)
        {
            return indent + "Type(" + id + ")";
        }
    }

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