before asking of course I searched for this problem and I found the information from Kyle with another user
"Please right click in the code window, then select References.
Next, press the add button to open a window where you'll select a file to reference.
Please navigate to: C:\Users\**your username**\Documents\NinjaTrader 7\bin\Custom
Select 'NinjaTrader.Vendor.dll' and press Open.
Click OK to exit the References menu.
Finally, recompile your scripts and the error should be cleared. "
but the message when compiling persists.
GOT IT! INFO: one has to search in the reference window for the referring line and then to delete. Then compiling again and it works
Best
Tony
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