"Warning: Failed to open stream" Error in Advanced

I'm getting the following errors... I'm guessing the last 4 are due to the first one not working right... any help is appreciated.

Warning: fopen(D:\Inetpub\wwwroot\alum\beta2\poll\textfile/polldata): failed to open stream: Permission denied in D:\Inetpub\wwwroot\alum\beta2\poll\textfile\include\class_session.php on line 48

Warning: flock(): supplied argument is not a valid stream resource in D:\Inetpub\wwwroot\alum\beta2\poll\textfile\include\class_session.php on line 49

Warning: fwrite(): supplied argument is not a valid stream resource in D:\Inetpub\wwwroot\alum\beta2\poll\textfile\include\class_session.php on line 50

Warning: flock(): supplied argument is not a valid stream resource in D:\Inetpub\wwwroot\alum\beta2\poll\textfile\include\class_session.php on line 51

Warning: fclose(): supplied argument is not a valid stream resource in D:\Inetpub\wwwroot\alum\beta2\poll\textfile\include\class_session.php on line 52