problems with installation

while and after the installation of DevYGO there were no problems. But if I run the game it only shows a popup

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Oooops! Something bad happened! Software will now exit!

Der Wert darf nicht NULL sein.
Parametername: item

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Only a Button with "Confirm" u can click.

1 yo Big-Tower i7-3770 3.4 GHz

Win 8.1 + media updated with all

For now try DN: www.duelingnetwork.com

It's usually a JS issue or Flash player. Our Moderators are better than myself in breaking this up, so wait for their reply, i'm not much of a use when it comes to DevPro.

Thx, but is this the only way? I thought it will be more like YGOpro or the official ygo online from the beginning auf this century.

Well I will have a look, but I don't think that this is the right thing for me.

I'll direct Moderators toward this topic, hope they can be helpful to you.

Give up
I'm having the same problem for ages and I can't fucking fix this

Devpro needs Netframework 4.5 or newer to run, also update all of your drivers including C++