External component has thrown an exception

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. 

 

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