[drupal-support] forum: "warning: in_array(): Wrong datatype for second argument..."

[Gabriele Caniglia]

My Drupal 4.6.1 is up and running on my localhost box (Mac OS X 10.4.1, 
Apache 1.3.33, Php 4.3.11, mod rewrite on) everything works flawlessly 
but the forum. I have enabled it through the admin/modules page.

When I click on node/add/forum, I get the following lines on top of the 
page:

warning: in_array(): Wrong datatype for second argument in 
/Users/cngg/Sites/musimac/modules/node.module on line 1296.
warning: in_array(): Wrong datatype for second argument in 
/Users/cngg/Sites/musimac/modules/node.module on line 1297.
warning: in_array(): Wrong datatype for second argument in 
/Users/cngg/Sites/musimac/modules/node.module on line 1298.
warning: in_array(): Wrong datatype for second argument in 
/Users/cngg/Sites/musimac/modules/node.module on line 1299.
warning: in_array(): Wrong datatype for second argument in 
/Users/cngg/Sites/musimac/modules/node.module on line 1300.

Any helpful hints?

TIA,
-- 
Gabriele Caniglia