Madspin crashes with mg5_path error

[Jeff Asaf Dror]

I'm trying to use Madspin on the fly using a simple test process, generate p p > t t~, and the default madspin card but I get the error,

  Error detected in "generate_events run_01"
  write debug file /home/jeffdror/Downloads/Programs/MG5_aMC_v2_2_1/test/run_01_tag_1_debug.log
  If you need help with this issue please contact us on https://answers.launchpad.net/madgraph5
  MadGraph5Error : Can't load MadSpin
             The variable mg5_path might not be correctly configured.

I'm not sure where to set mg5_path so I can't check whether this is configured correctly.I've attached the log file.

Possibly relevant system details:
Ubuntu 14.04
64 bit

[Olivier Mattelaer (olivier-mattelaer)]

Hi,

the mg5_path is part of the following configuration file:
./Cards/me5_configuration.txt
and need to point to a valid MG5 directory for some of the functionality (one of them is MadSpin)

Cheers,

Olivier

On 15 Apr 2015, at 02:45, Jeff Asaf Dror <email address hidden> wrote:

> Public bug reported:
>
> I'm trying to use Madspin on the fly using a simple test process,
> generate p p > t t~, and the default madspin card but I get the error,
>
> Error detected in "generate_events run_01"
> write debug file /home/jeffdror/Downloads/Programs/MG5_aMC_v2_2_1/test/run_01_tag_1_debug.log
> If you need help with this issue please contact us on https://answers.launchpad.net/madgraph5
> MadGraph5Error : Can't load MadSpin
> The variable mg5_path might not be correctly configured.
>
> I'm not sure where to set mg5_path so I can't check whether this is
> configured correctly.I've attached the log file.
>
> Possibly relevant system details:
> Ubuntu 14.04
> 64 bit
>
> ** Affects: mg5amcnlo
> Importance: Undecided
> Status: New
>
>
> ** Tags: madspin
>
> ** Attachment added: "run_01_tag_1_debug.log"
> https://bugs.launchpad.net/bugs/1444227/+attachment/4375740/+files/run_01_tag_1_debug.log
>
> ** Tags added: madspin
>
> --
> You received this bug notification because you are subscribed to
> MadGraph5_aMC@NLO.
> https://bugs.launchpad.net/bugs/1444227
>
> Title:
> Madspin crashes with mg5_path error
>
> Status in MadGraph5_aMC@NLO Generator:
> New
>
> Bug description:
> I'm trying to use Madspin on the fly using a simple test process,
> generate p p > t t~, and the default madspin card but I get the error,
>
> Error detected in "generate_events run_01"
> write debug file /home/jeffdror/Downloads/Programs/MG5_aMC_v2_2_1/test/run_01_tag_1_debug.log
> If you need help with this issue please contact us on https://answers.launchpad.net/madgraph5
> MadGraph5Error : Can't load MadSpin
> The variable mg5_path might not be correctly configured.
>
> I'm not sure where to set mg5_path so I can't check whether this is
> configured correctly.I've attached the log file.
>
> Possibly relevant system details:
> Ubuntu 14.04
> 64 bit
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/mg5amcnlo/+bug/1444227/+subscriptions

[Jeff Asaf Dror (asafjeffdror)]

Hi Olivier,

Thanks for the response. I just checked the me5_configuration.txt file and the mg5_path is pointing to a valid MG5 directory. Do you know of any other reasons why this error message would appear?

[Olivier Mattelaer (olivier-mattelaer)]

Looks like they are an error when loading MadSpin,

in order to have more clue what the problem is. I would need you to run in debug mode:
i.e. launch your script with
./bin/mg5_aMC —debug

Then the debug file, should have more information about the reason of the crash.

Cheers,

Olivier

On 15 Apr 2015, at 10:51, Jeff Asaf Dror <email address hidden> wrote:

> Hi Olivier,
>
> Thanks for the response. I just checked the me5_configuration.txt file
> and the mg5_path is pointing to a valid MG5 directory. Do you know of
> any other reasons why this error message would appear?
>
> --
> You received this bug notification because you are subscribed to
> MadGraph5_aMC@NLO.
> https://bugs.launchpad.net/bugs/1444227
>
> Title:
> Madspin crashes with mg5_path error
>
> Status in MadGraph5_aMC@NLO Generator:
> New
>
> Bug description:
> I'm trying to use Madspin on the fly using a simple test process,
> generate p p > t t~, and the default madspin card but I get the error,
>
> Error detected in "generate_events run_01"
> write debug file /home/jeffdror/Downloads/Programs/MG5_aMC_v2_2_1/test/run_01_tag_1_debug.log
> If you need help with this issue please contact us on https://answers.launchpad.net/madgraph5
> MadGraph5Error : Can't load MadSpin
> The variable mg5_path might not be correctly configured.
>
> I'm not sure where to set mg5_path so I can't check whether this is
> configured correctly.I've attached the log file.
>
> Possibly relevant system details:
> Ubuntu 14.04
> 64 bit
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/mg5amcnlo/+bug/1444227/+subscriptions

[Jeff Asaf Dror (asafjeffdror)]

Hi Olivier,

Running in debug mode gave the same file I attached earlier. I'm not sure if this was the expected result, but I've attached is the screen output after running in debug mode in case that helps.

[Olivier Mattelaer (olivier-mattelaer)]

Hi,

No clearly not, I was expecting another error.
Then the only way is to modify the code to have the real error:

could you modify the file
/home/jeffdror/Downloads/Programs/MG5_aMC_v2_2_1/madgraph/interface/common_run_interface.py
around line 1730
you should have:

            if __debug__:
                raise
            else:
                raise self.ConfigurationError, '''Can\'t load MadSpin
            The variable mg5_path might not be correctly configured.’''

Could you replace it by:
            if True:
                raise

Thanks for your patience,

Olivier

On 15 Apr 2015, at 12:18, Jeff Asaf Dror <email address hidden> wrote:

> Hi Olivier,
>
> Running in debug mode gave the same file I attached earlier. I'm not
> sure if this was the expected result, but I've attached is the screen
> output after running in debug mode in case that helps.
>
> ** Attachment added: "debug.log"
> https://bugs.launchpad.net/mg5amcnlo/+bug/1444227/+attachment/4376129/+files/debug.log
>
> --
> You received this bug notification because you are subscribed to
> MadGraph5_aMC@NLO.
> https://bugs.launchpad.net/bugs/1444227
>
> Title:
> Madspin crashes with mg5_path error
>
> Status in MadGraph5_aMC@NLO Generator:
> New
>
> Bug description:
> I'm trying to use Madspin on the fly using a simple test process,
> generate p p > t t~, and the default madspin card but I get the error,
>
> Error detected in "generate_events run_01"
> write debug file /home/jeffdror/Downloads/Programs/MG5_aMC_v2_2_1/test/run_01_tag_1_debug.log
> If you need help with this issue please contact us on https://answers.launchpad.net/madgraph5
> MadGraph5Error : Can't load MadSpin
> The variable mg5_path might not be correctly configured.
>
> I'm not sure where to set mg5_path so I can't check whether this is
> configured correctly.I've attached the log file.
>
> Possibly relevant system details:
> Ubuntu 14.04
> 64 bit
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/mg5amcnlo/+bug/1444227/+subscriptions

[Jeff Asaf Dror (asafjeffdror)]

Hi Olivier,

I wasn't able to find exactly the if statement you mention but I hope I did an equivalent modification. I found the lines (around 1730):
        try:
             import MadSpin.decay as decay
             import MadSpin.interface_madspin as interface_madspin
        except ImportError:
            raise self.ConfigurationError, '''Can\'t load MadSpin
            The variable mg5_path might not be correctly configured.'''
I changed these to
        import MadSpin.decay as decay
        import MadSpin.interface_madspin as interface_madspin

The new debug file is attached. It seems to suggest I'm missing an "aloha" module.

[Olivier Mattelaer (olivier-mattelaer)]

Hi,

Indeed we move that file, but I thought that it was either in 2.2.3 or more likely in 2.3.0.
In any case, I have put that file in attachment.
you have to put in the following directory:
tests/unit_tests/various

Cheers,

Olivier

PS: It might be safer to re-download a full version of Madgraph, to be sure to use a clean version of the code.

[Jeff Asaf Dror (asafjeffdror)]

Hi Olivier,

I have re-downloaded the a clean version and now it works well. Looking back at my old Madgraph directory I see that I don't have a tests directory at all. I have a tendancy to name directories test and delete them so most likely I accidentally deleted the "tests" directory as well...

Thanks for your help and sorry for the trouble,
Jeff