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YAML Parsing Errors Using CPAN on Windows

by roho (Monsignor)
on Feb 05, 2010 at 18:20 UTC ( #821624=perlquestion: print w/ replies, xml ) Need Help??
roho has asked for the wisdom of the Perl Monks concerning the following question:

I am consistently getting YAML parsing errors trying to install modules on Windows using cpan (see output below). I have tried deleting the 'cpan' directory under 'C:\Perl' and rerunning the cpan install, but I get the same errors. Any ideas on how I might correct this?

I am running Activestate Perl 5.8.9. I first tried using 'ppm' but 'HTML::TreeBuilder' was not in Activestate's archive, hence the attempt to use 'cpan'.

TIA, Roy

C:\>cpan cpan shell -- CPAN exploration and modules installation (v1.9402) Enter 'h' for help. cpan> install HTTP::TreeBuilder Fetching with LWP: http://ppm.activestate.com/CPAN/authors/01mailrc.txt.gz Going to read 'C:\Perl\cpan\sources\authors\01mailrc.txt.gz' ...................................................................... +......DONE Fetching with LWP: http://ppm.activestate.com/CPAN/modules/02packages.details.txt.gz Alert: While trying to 'parse' YAML file 'C:\Perl\cpan\FTPstats.yml' with 'YAML::XS' the following error was encountered: Usage: YAML::XS::LibYAML::Load(yaml_sv) at C:\Perl\lib/YAML/XS.pm li +ne 70. Going to read 'C:\Perl\cpan\sources\authors\01mailrc.txt.gz' ...................................................................... +......DONE Going to read 'C:\Perl\cpan\sources\modules\02packages.details.txt.gz' Database was generated on Wed, 03 Feb 2010 22:45:58 GMT ...................................................................... +......DONE Fetching with LWP: http://ppm.activestate.com/CPAN/modules/03modlist.data.gz Alert: While trying to 'parse' YAML file 'C:\Perl\cpan\FTPstats.yml' with 'YAML::XS' the following error was encountered: Usage: YAML::XS::LibYAML::Load(yaml_sv) at C:\Perl\lib/YAML/XS.pm li +ne 70. Lockfile removed.
C:\>

"Its not how hard you work, its how much you get done."

Comment on YAML Parsing Errors Using CPAN on Windows
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Re: YAML Parsing Errors Using CPAN on Windows
by Anonymous Monk on Feb 05, 2010 at 19:57 UTC
    I had the same problem. The solution was to make CPAN stop loading YAML, but I don't remember exactly how. Here's what o conf shows me for yaml vars:
    yaml_load_code [undef] yaml_module []
    I don't know how to undef a value from within CPAN, and perldoc isn't helpful for the shell, but I assume somebody here knows. As a last resort you could edit CPAN.pm. And don't forget to o conf commit to write any changes to disk from within the CPAN shell.
      from within cpan shell, enter: o conf yaml_module "" o conf commit
        - this appears to be mostly a permissions error (and YAML module error) under windows. <thus the unix'ie perl guys don't see this error.> The cpan error response is mostly unhelpful...but if you just rename the file, then cpan appears to fix itself. I was able to load/reload Yaml. This looks like a cpan/perl installation induced bug. If this file needs to be rename it should be installed in a location that has sufficient permissions...nuff said.

        - don't know what is up with the HTML::EP suggestion. That seems a bit pointless to install that module without a need...

        - oh, also, disabling yaml via o conf will not correct the problem until the FTPStats.yml file is renamed...

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