validate form CI4

"Argument 1 passed to helper() must be of the type string, array given, called in C:\xampp\htdocs\ci4m_framework\application\Controllers\Login.php on line 10"

It tells you exactly what the error is there. The `helper()` method doesn't currently allow more than one helper to be loaded at a time. Hence, it requires a string, not an array. It probably should, and I'll make an issue to that affect to remind me, but doesn't currently. In your case, it's not biggie - the url helper is loaded by default.

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