Pluskit and google docs

I followed the steps for using pluskit and google doc but got several errors on the uploaded page:

Strict Standards: Redefining already defined constructor for class Net_URL in …/public_html/pluskit/files/URLrb.php on line 122

Strict Standards: Non-static method PEAR::isError() should not be called statically, assuming $this from incompatible context in…/public_html/pluskit/files/Requestrb.php on line 594

Any help or suggestions?