My 2 paisas

Posts Tagged ‘error

Around 4-5 months ago I had an idea of starting a portal dedicated only to all the errors faced by GNU/Linux users. I had thought that if there is one portal where every user can post and search for the error message that he got while using GNU/Linux, sooner or later these portal will become a good database of all the commonly found errors faced while using GNU/Linux. And then I had thought of using Adsense to generate money to maintain portal and if possible make some profit myself.

However the main question that I asked to myself before using Adsense was “Can I restrict the Ads that are displayed through Adsense?” Because I didnt want the portal to end up promote any proprietary softwares through google adsense? I knew about Adbard then, but I did not believe using Adbard would help me earn as much as Adsense. Anyways I thought that google must have some way through which I can restrict some ads or allow only a category of ads. So when I asked this question in the Google Adsense help forum they told me that unfortunately they did not have any category for proprietary softwares. Anyways I figured out Adbard was the only solution for my problem.

I remembered the situation after all these days when I opened a blog by a core developer of Ubuntu Server and I see MIcrosoft Online Services ad, sad isnt it?
Why Open source enthusiasts should not use Google Adsense?

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I wanted to commit to a repository but whenever i tried the “svn commit” command. I was getting the following error.
svn: Server sent unexpected return value (500 Internal Server Error) in response to MKACTIVITY request for’ ‘
Well I did not understand what the error was till i checked the svn info.
The error was because I had checked out the code using http protocol and hence I had not been authorized to commit. So what I did was checkout the code again using https protocol.
However my senior told me that the right way is to do “svn switch”.

svn switch NEW_URL

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I got this error when I was trying to get my drupal installation authenticate using the local ldap directory. Initially, I had thought that I was getting error because of my ldap settings. Then I enabled error reporting on my site, that is when this error was displayed to me.

This error is caused, I suppose due to the missing package php5-ldap in the system. After I installed this package using apt-get and restarted apache2, LDAP authentication wroked fine.

Courtsey: http://drupal.org/node/158043
Enable Error Reporting

Although it may be turned off on commercial hosts and production sites (for good reason, so that users do not see the errors), these errors are one of your best tools for troubleshooting. To enable error reporting, temporarily edit your index.php file (normally located in your root directory) directly after the first opening PHP tag (do not edit the actual file info!) to add the following:

<?php

error_reporting(E_ALL);
ini_set('display_errors', TRUE);
ini_set('display_startup_errors', TRUE);

// $Id: index.php,v 1.94 2007/12/26...

You will now be able to see any errors that are occurring directly on the screen. Memory problems may still not be displayed, but it’s the first step in a process of elimination.

If you are using a multi-site setup and only want errors to appear for one site, then check the name of the host first as in:

I was trying to add a twibbon on my gravatar to support 5 years of Mozilla and I got the following error from the server. It made me realize that twibbon and twitter must be running on windows server. Hence thought of shifting immediately to identi.ca. The error is following. Hope it will be useful to crack into the server. ;).
[ArgumentException: You must specify a token]
Twibbon.Services.TwitterService.GetUserByToken(OAuthToken access, Int32 attempt, String ipAddress) in D:\Development\Twibbon\trunk\Twibbon.Services\Twitter\TwitterService.cs:870
Twibbon.Services.TwitterService.GetUserByToken(OAuthToken access, Int32 attempt, String ipAddress) in D:\Development\Twibbon\trunk\Twibbon.Services\Twitter\TwitterService.cs:868
Twibbon.Web.Controllers.AuthenticateController.Index(String returnUrl) in D:\Development\Twibbon\trunk\Twibbon.Web\Controllers\AuthenticateController.cs:49
lambda_method(ExecutionScope , ControllerBase , Object[] ) +85
System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +17
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +178
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +24
System.Web.Mvc.c__DisplayClassa.b__7() +52
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +254
System.Web.Mvc.c__DisplayClassc.b__9() +19
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +192
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +399
System.Web.Mvc.Controller.ExecuteCore() +126
System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +27
System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +7
System.Web.Mvc.MvcHandler.ProcessRequest(HttpContextBase httpContext) +151
System.Web.Mvc.MvcHandler.ProcessRequest(HttpContext httpContext) +57
System.Web.Mvc.MvcHandler.System.Web.IHttpHandler.ProcessRequest(HttpContext httpContext) +7
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +181
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75

Courtsey: Daniel Lorch

To install mysql bindings for ruby, use this command
#gem install mysql

You might get the following error:

“extconf.rb:1:in `require’: no such file to load — mkmf (LoadError)”

This probably means that you forgot to install the ruby1.8-dev package. Just do an apt-get install ruby1.8-dev to fix this.

Again after this you might this error:

“Could not create Makefile due to some reason [..] Check the mkmf.log file for more details. [..]”

You should do what the error message tells you: check the mkmf.log! Search for this file using find /usr/lib/ruby/gems/1.8/gems/ -name mkmf.log. Usually, this error message appears because you forgot to install the -dev package for the extension you were trying to install. So if you wanted to install the mysql gem, you probably forgot to install the libmysqlclient14-dev first. Do an apt-cache search | grep dev to find the appropriate packages.

Courtsey: Simon Josefsson Datakonsult

RAILS_ENV=”production”

(in /home/redmine/redmine)
rake aborted!
No such file or directory – /tmp/mysql.sock

(See full trace by running task with –trace)

The problem is that you need the Ruby MySQL wrappers. This isn’t really clear from the error message. Install it using:

# apt-get install libmysql-ruby

This is one of the errors that I got when I started using perl modules.
It was because I had not put “1;” at the end of my perl module. So I did not get the error after I put “1;” at the end of the perl module.

why is the “1;” necessary at the end of perl modules?

Typically, a module contains a bunch of subroutine definitions.  A
module may also contain code which is not part of a subroutine. This
code is executed at the time the module is loaded, so it can be used
to initialize the module. For example, the module might open
adatatbase connection or initialize some time at the time it is
loaded.


Such code might be successful, or it might fail. Perl allows the
module to indicate the result by returning a true or false value back
to its caller. If the value is false, Perl aborts the compilation
with an error message.

Unfortunately, the default return value is *false*, so a module which
just defines a bunch of subroutines, and which has no initialization
code, accidentally returns a false value back to the caller, and Perl
aborts. So we insert "1;" at the end to suppress this misbehavior.

http://dev.perl.org/rfc/269.pod
http://dev.perl.org/rfc/269.html

discusses this in some more detail.

For documentation, see perldiag:

%s did not return a true value
(F) A required (or used) file must return a true value
to indicate that it compiled correctly and ran its
initialization code correctly. It's traditional to
end such a file with a "1;", though any true value
would do. See the require entry in the perlfunc man-
page.

and the relevant part of 'perlfunc':

The file must return true as the last statement
to indicate successful execution of any initialization code, so
it's customary to end such a file with "1;" unless you're sure
it'll return true otherwise. But it's better just to put the
"1;", in case you add more statements.

Courtsey: http://lists.netisland.net/archives/phlpm/phlpm-2001/msg00426.html
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