Parser errors in .less files not being displayed

[John]

I've just upgraded from a semi-ancient version of .less to the latest
version (1.3.0.3) and have noticed a change in the way parser errors
are reported.

Originally if I browsed to a less file and there was an error, I would
get a helpful message pointing me at the exact place where the error
was occurring.

However, now I get one of two things. Initially a big yellow .net
error with this::

Exception type: InvalidOperationException
Exception message: VaryByCustom is already set.
at System.Web.HttpCachePolicy.SetVaryByCustom(String custom)
at System.Web.HttpCachePolicyWrapper.SetVaryByCustom(String custom)
at dotless.Core.Response.CachedCssResponse.WriteCss(String css)
at dotless.Core.HandlerImpl.Execute()
at dotless.Core.LessCssHttpHandler.ProcessRequest(HttpContext
context)
at
System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
at System.Web.HttpApplication.ExecuteStep(IExecutionStep step,
Boolean& completedSynchronously)


If I then refresh I get a completely blank page.

I'm using this in an Umbraco v4.7.2 site if that makes any
difference. It's a bit of a pain not seeing the detailed error as it
makes tracking bugs completely trial and error.

John

[Luke Page]

We have a bug that errors in imported files don't get reported correctly.. maybe its that?

If so I aim to look at it in the next couple of weeks unless noone beats me to it.

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[John]

Hi Luke,

That's exactly it - thanks! Sorry, I should have said exactly which
errors I was getting. :)

Much appreciated!

John

On May 23, 7:47 pm, Luke Page <luke.a.p...@gmail.com> wrote:
> We have a bug that errors in imported files don't get reported correctly..
> maybe its that?
>
> If so I aim to look at it in the next couple of weeks unless noone beats me
> to it.

>  On May 23, 2012 3:41 PM, "John" <pdmsjo...@gmail.com> wrote:
>
>
>
>
>
>
>
> > I've just upgraded from a semi-ancient version of .less to the latest
> > version (1.3.0.3) and have noticed a change in the way parser errors
> > are reported.
>
> > Originally if I browsed to a less file and there was an error, I would
> > get a helpful message pointing me at the exact place where the error
> > was occurring.
>
> > However, now I get one of two things.  Initially a big yellow .net
> > error with this::
>
> >    Exception type: InvalidOperationException
> >    Exception message: VaryByCustom is already set.
> >   at System.Web.HttpCachePolicy.SetVaryByCustom(String custom)
> >   at System.Web.HttpCachePolicyWrapper.SetVaryByCustom(String custom)
> >   at dotless.Core.Response.CachedCssResponse.WriteCss(String css)
> >   at dotless.Core.HandlerImpl.Execute()
> >   at dotless.Core.LessCssHttpHandler.ProcessRequest(HttpContext
> > context)
> >   at
>

> > System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplicat­ion.IExecutionStep.Execute()

[Luke Page]

For those not following github with an eagle eye, this is now fixed in
source and will be included in the next release. From the look of it,
it has been broken for a long time, the design of how errors in
imported files worked and accessing variables from imported files was
conflicting, so I had to change the errors part.

[Daniel Hölbling]

Great job Luke!

[John]

That's great - thanks very much!

[jo...@johnpapa.net]

Has this been fixed and if so, what version is it in?

-- JP

>> > dotless+unsubscribe@googlegroups.com.

>> > For more options, visit this group at
>> >http://groups.google.com/group/dotless?hl=en.
>
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[Luke Page]

Fixed, but not released.

I can do a release if people want it.

To view this discussion on the web visit https://groups.google.com/d/msg/dotless/-/PW5LiIRVM2gJ.

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[ruiz.n...@gmail.com]

Hi Luke,

Yes, I would like to, if that's possible.

Thanks,

Nicolas.

[devm...@hotmail.com]

Kindly yes please, i am facing same error.

thanks in advanced.

[Luke Page]

I will do one in the next couple of days, just want to resolve the
current discussion on embedded resources.

>>>> >> > dotless+u...@googlegroups.com.

>>>> >> > For more options, visit this group at
>>>> >> >http://groups.google.com/group/dotless?hl=en.
>>>> >
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>>>> > dotless+u...@googlegroups.com.

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>>>> >
>>>
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>
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[Joao Leme]

I want it! Where can I find it?

On Jun 14, 3:06 am, Luke Page <luke.a.p...@gmail.com> wrote:
> Fixed, but not released.
>
> I can do a release if people want it.

>  On Jun 14, 2012 6:01 AM, <j...@johnpapa.net> wrote:> Has this been fixed and if so, what version is it in?

>
> > -- JP
>
> > On Saturday, June 2, 2012 6:15:52 AM UTC-4, Luke wrote:
>
> >> For those not following github with an eagle eye, this is now fixed in
> >> source and will be included in the next release. From the look of it,
> >> it has been broken for a long time, the design of how errors in
> >> imported files worked and accessing variables from imported files was
> >> conflicting, so I had to change the errors part.
>

> >> >> >   at System.Web.HttpCachePolicy.**SetVaryByCustom(String custom)
> >> >> >   at System.Web.**HttpCachePolicyWrapper.**SetVaryByCustom(String
> >> custom)
> >> >> >   at dotless.Core.Response.**CachedCssResponse.WriteCss(**String
> >> css)
> >> >> >   at dotless.Core.HandlerImpl.**Execute()
> >> >> >   at dotless.Core.**LessCssHttpHandler.**ProcessRequest(HttpContext
> >> >> > context)
> >> >> >   at
>
> >> >> > System.Web.HttpApplication.**CallHandlerExecutionStep.**
> >> System.Web.HttpApplicat­ion.**IExecutionStep.Execute()
> >> >> >   at System.Web.HttpApplication.**ExecuteStep(IExecutionStep step,

> >> >> > Boolean& completedSynchronously)
>
> >> >> > If I then refresh I get a completely blank page.
>
> >> >> > I'm using this in an Umbraco v4.7.2 site if that makes any
> >> >> > difference.  It's a bit of a pain not seeing the detailed error as
> >> it
> >> >> > makes tracking bugs completely trial and error.
>
> >> >> > John
>
> >> >> > --
> >> >> > You received this message because you are subscribed to the Google
> >> Groups
> >> >> > "DotLess (Less Css for .NET)" group.
> >> >> > To post to this group, send email to dot...@googlegroups.com.
> >> >> > To unsubscribe from this group, send email to

> >> >> > dotless+unsubscribe@**googlegroups.com<dotless%2Bunsu...@googlegroups.com>.

>
> >> >> > For more options, visit this group at

> >> >> >http://groups.google.com/**group/dotless?hl=en<http://groups.google.com/group/dotless?hl=en>.

>
> >> > --
> >> > You received this message because you are subscribed to the Google
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> >> > To unsubscribe from this group, send email to dotless+unsubscribe@**
> >> googlegroups.com <dotless%2Bunsu...@googlegroups.com>.
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> >> group/dotless?hl=en <http://groups.google.com/group/dotless?hl=en>.

[Luke Page]

Latest release on github or nu get.

[xavier...@gmail.com]

Hi Luke,

I am using 1.3.0.5 and I still see this issue occurring ?

Sometimes I see the 'VaryByCustom' error and sometimes a blank page (from the same code, I saw the VaryByCustom error, then hit F5 and then a blank page, served with a 200 HTTP code).

> >> googlegroups.com <dotless%2B...@googlegroups.com>.

[Luke Page]

There is a different bug about sometimes an error causing an exception because vary by is set twice. There is a pull request, but I want it done properly (not just try-catch).

I'm quite busy with less.js at the moment and was thinking of releasing both at the same time.

To view this discussion on the web visit https://groups.google.com/d/msg/dotless/-/6t9tGuSHV0kJ.

[xavier...@gmail.com]

Thanks for the response, Luke. No worries, just wanted to confirm/report the issue. Thanks for looking into it.

> >> >> > dotless+unsubscribe@**googlegroups.com<dotless%2Bunsubscribe@googlegroups.com>.

[taw...@gmail.com]

Also getting this same error from the latest package on Nuget

VaryByCustom is already set.

Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. 

Exception Details: System.InvalidOperationException: VaryByCustom is already set.

Source Error: 

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.

Stack Trace: 

[InvalidOperationException: VaryByCustom is already set.] System.Web.HttpCachePolicy.SetVaryByCustom(String custom) +3175314 System.Web.HttpCachePolicyWrapper.SetVaryByCustom(String custom) +11 dotless.Core.Response.CachedCssResponse.WriteCss(String css) +270 dotless.Core.HandlerImpl.Execute() +167 dotless.Core.LessCssHttpHandler.ProcessRequest(HttpContext context) +133 System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +100 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +75

[Luke Page]

Fixed in trunk, will be in next release

https://github.com/dotless/dotless/commit/2a1572e208acb861ed362f2b1e3b6e5180779bde

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