the website obstructs

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Hey concrete5,

I almost dare not to ask anymore.
I am in trouble again.
I did install concrete5 on my local machine, mainly to experiment and testing with C5.
One aspect is for instance to learn to work with the Toesslab add-on.
But, here is comes, The website seems to work properly until I select the toesslab option in the dashboard. Than my computer obstructs, nothing is possible any more.
I have to ask how it is possible.
A version of a kind of language or something, I don't know.
thank you for being there

stedereu