External component has thrown an exception

[BUM3CLJ]

Hello,

Does everyone knows or might guess the cause of thins kind of error ? When I try to open a Function Bloc it shows this message .

if I press OK will disappear but It will appear when I try to open another FB. If I close everything and I reopen it disappear. But I don't understand the real cause . 

Many thanks in advance for your responses. 

[Thorsten_Brach]

It looks to me, as the TwinCat installation is corrupt...

So I would recommend uninstalling TwinCat completely and reinstalling it after a reboot...