Weird error using built-in array methods

[ElRubioLoco]

In my split string method, the built-in array methods calls generate errors :

• ERR: No matching symbol 'insertLast'
• ERR: No matching symbol 'findFirst'

Here is my function :

array<string> splitString(const string& in str, const string& in delimiter) {
    array<string> result;

    int startPos = 0;
    int endPos = str.findFirst(delimiter);

    while (endPos != -1)
    {
        result.insertLast(str.substr(startPos, endPos - startPos));
        startPos = endPos + delimiter.Length;
        endPos = str.find(delimiter, startPos);
    }

    result.insertLast(str.substr(startPos));

    return result;
}

Here the array is correctly initialized and the used methods are referenced here in AngelScript documentation...