is this validation class limitation?

[eluser]webbymonk[/eluser]
Hey Guys,

I have tried to set rules for validation, but i have an array of same-name field

Code:

<input type="text" name="fieldname[]" />
<input type="text" name="fieldname[]" />
<input type="text" name="fieldname[]" />
<input type="text" name="fieldname[]" />

i tried to set rules in the validation

Code:

$rules['fieldname'][] = 'required'

and the result gave the error

Code:

A PHP Error was encountered

Severity: Notice

Message: Array to string conversion

Filename: libraries/Validation.php

Line Number: 195