In Today’s article I discuss the new “Tag Database Not Found” error you get when you try to open a project created in v10 of FactoryTalk View Studio Machine Edition.

I was recently given a version 8 .MER runtime file which I wanted to take a look at in FactoryTalk View Studio Machine Edition version 9.

I first used the Application Manager to restore the .MER to a application, and then proceeded to open the project in View Studio.

Towards the end of opening the application, I received the error, “Tag Database not Found,” as shown below:

Turns out that while the .MER was compiled for a v8 PanelView Plus, the version of ViewStudio used was v10.

And when you create a .MER file with v10, you are warned that to restore and open the project in a previous version of View Studio you’ll need to install the latest patch roll-up for that previous version:

For more information, as well as a link to the patch, click HERE.

To watch a video demonstration of the above, check out Episode 46 of The Automation Minute Season 4 below:

If you found this article helpful, please share it with your colleagues on LinkedIn, Facebook, Twitter or Goggle Plus!

And if you know anyone who would benefit from Allen-Bradley PLC, HMI, or SCADA training, please let them know about my affordable courses over at TheAutomation School.

You can also share your own thoughts and opinions on this subject by clicking on the “post a comment or question” link below.

Until next time, Peace ✌️ 

Shawn M Tierney
Technology Enthusiast & Content Creator

Have a question? Join my community of automation professionals and take part in the discussion! You'll also find my PLC, HMI, and SCADA courses at

If you found this content helpful, consider buying me a coffee here.

Shawn Tierney



  1. Dear sir, do you know how to troubleshoot this error kindly:

    “Cannot restore tag database, creating an empty tag database file”; I uploaded .mer directly from HMI, and then I select “restore runtime program”, then this error pops up first. How to solve? Thank you kindly.


Please enter your comment!
Please enter your name here