Ion Auth - Lightweight Auth System based on Redux Auth 2

[eluser]dhaulagiri[/eluser]
why I am getting this error

Severity: 4096
Message: Object of class stdClass could not be converted to string
Filename: libraries/Loader.php(673) : eval()'d code
Line Number: 3

while doing

Code:

<?php echo $this->ion_auth->get_user();?>