Error when executing VI with "Invoke Node" in loop

Question

Hello,
please check if this is possible what i am doing here or if there is a better way to do it.
The goal is to have a VI that i can start in TestStand which is then running in a loop until i set a global variable.
I do this currently with:
1.) Starting the VI with "Invoke Node" (see screenshot 01)
2.)  This Vi is then running all the time in a loop until the global for exiting is True (screenshot 02)
3.) Then i have another VO to set the Quit-variable to true
Normally this works as it should, but sometimes i get the error-message:
Invoke Node in NameOfTheViCalledInTestStand.vi
Method Name: Run VI
VI Path: NameOfTheViThatContainsTheInvokeNode.vi
LabVIEW:  Das VI befindet sich in einem für  diese Operation unzulässigen Zustand.
 The question is: what does this error mean and what better ways are there to do what i want to.
Perhaps for better understanding, the VI which runs in a loop executes dll-functions to enable and disable an ample-tower to make a light blinking.
And because there is no function "blink", i have to make it on off on off on off....
So the vi loops and makes on off until i say "quit" then blinking stops.
Thanks for any ideas
Attachments:
01_InvokeNode.jpg ‏8 KB
02_ViRunsInLoop.jpg ‏23 KB

Answer 1

I cant´t do this "Try changing the "Run" node
to "Wait Until Done" = True." because then the TestStand-Step is
hanging until the loop is finished.
I only want to start the "blinking" and the continue normally in the sequence.
To
avoid that the vi with the "Invoke Node" is started twice a have a vi
above it whick checks with the globalVariable "IsCurrentlyBlinking" if
the start is allowed.
If  IsCurrentlyBlinking= True then nothing happens.
So normally it can´t happen  that it starts twice. Only if the GlobalVariables are not correct.
The
variable "IsCurrentlyBlinking"is set to TRUE in the subvi before the
loop starts and after the loop is finished its set to FALSE in the
subvi.
Attachments:
03_CheckStart.jpg ‏16 KB