HMI - Target machine could not be found

Hello,

I have a problem on the PLC, that when I start the HMI, it says that "Target machine could not be found" (see attached picture), but the PLC is in RUN, and I don't understand what is the problem!ย 

Maybe someone of you, had this problem before, and knows the solution! ๐Ÿ™‚ย 

Thanks!

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