Comments for

[Action Streams] "Can't use an undefined value as a HASH reference" error during install/upgrade

2008-01-30T20:14:00Z

I installed this today but its not working. The upgrade routine does not complete. I get this error message:

Can't use an undefined value as a HASH reference at /usr/local/www/sharedapps/mt/cgi-bin/extlib/Data/ObjectDriver/BaseObject.pm line 283.

From a bit of debugging, it appears that ActionStream's Event object is causing this. The properties object is not defined when it tries to get the $_[0]->properties->{datasource} value.

I have MT 4.1 installed clean with MySQL.

Comment from David Jacobs on 2008-01-30

2008-01-30T22:07:26Z

Hey Brandon,
Did you upload the "extlib" directory from the plugin? That error normally means there is a required library which isn't instaled.

--David

Comment from Brandon Fuller on 2008-01-30

2008-01-30T22:56:28Z

Thanks for the thought. I re-uploaded extlib and its working now. I think there might have been a conflict.

Comment from Brock on 2008-01-31

2008-01-31T13:32:41Z

I'm having the same problem as Brandon, but less luck in fixing it. I've completely replaced the extlib directory - started off with what's in the MTP 4.1 zip, then merged in the Action Streams items, and I'm still getting it. Are there other libraries I might be missing?

Thanks!

Comment from Mark Paschal on 2008-01-31

2008-01-31T18:50:03Z

Brock: That error does indicate a missing dependency for Web::Scraper. If you have command line access, you might run:

perl -Iextlib -MWeb::Scraper -e 1

and see if it complains about a missing module. If not, a similar approach in a CGI could work.

Comment from Brock on 2008-01-31

2008-01-31T19:03:42Z

Mark - thanks for the details. As it turns out, I had put Web::Scraper in the WWW dir, because...well, because I'm dumb.

As it turns out, that didn't totally solve the problem. I'm still getting an error from the CGI script you linked to:

Weak references are not implemented in the version of perl at extlib/HTML/TreeBuilder/XPath.pm line 93
BEGIN failed--compilation aborted at extlib/HTML/TreeBuilder/XPath.pm line 93.
Compilation failed in require at extlib/Web/Scraper.pm line 9.
BEGIN failed--compilation aborted at extlib/Web/Scraper.pm line 9.
Compilation failed in require at (eval 1) line 1.
BEGIN failed--compilation aborted at (eval 1) line 1.

Unfortunately, my knowledge of Perl is newb at best, but I'm going to keep poking it with a stick to see if I can't make something come out.

Comment from Mark Paschal on 2008-01-31

2008-01-31T23:21:20Z

Brock: no problem, it can be tricky to get all the parts in the right place! The instructions are a little more complex than they could be because sometimes people using cgi-bin directories have to move mt-static out of the application directory.

Weak references were added in 1.6.0, so as long as your perl is newer than that, it should work fine. However this thread at perlmonks suggests sometimes Scalar::Util or perl are miscompiled to think they don't have weak references. You might try the last suggestion of reinstalling Scalar::Util from CPAN, if you were using your OS's package management and it still doesn't work.