[TYPO3] Press2web install error

[Junior]

Hi all,

when i try to install the press2web extension, i get the following  
error:

Warning: fopen(/home/sistema/public_html/cms/typo3conf/ext/p2wlib/):  
failed to open stream: Is a directory in /home/sistema/public_html/ 
cms/t3lib/class.t3lib_div.php on line 2375
Extension Manager
Extension import results
Error: File "/home/sistema/public_html/cms/typo3conf/ext/p2wlib/"  
could not be created!!!


Any body here experienced problems with this extensions?

thanks


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