# Causes of run-time errors for legacy ME Station applications

If a user attempts to run an earlier version application on an earlier version FactoryTalk View Machine Edition, the following message may appear:

"Failed to load Tag Config Server"

A possible reason for this message is that the application file (.mer) created with FactoryTalk View Studio 6.10 or later is not compatible with the old database. For example, you cannot run an application created with FactoryTalk View Studio 6.10 on ME Station 6.0.

FactoryTalk View Machine Edition Station 6.0 and earlier cannot run an application that is created with FactoryTalk View Studio 6.10 or later installed on a 64-bit OS since the database is incompatible.

FactoryTalk View Studio 6.10 or later installed on a 64-bit OS will not create a 6.0 or earlier version application with Allow Conversion option enabled.

MER | Created with | MER Conversion Setting | FactoryTalk View Machine Edition Station 6.10 or later | FactoryTalk View Machine Edition Station 6.0 or earlier
x32 OS | x64 OS | x32 OS
6.0 or earlier MER | FactoryTalk View Studio 6.0 or earlier | Allow | Compatible | Compatible | Compatible
Disallow | Compatible | Compatible | Compatible
FactoryTalk View Studio 6.10 or later on a 32-bit OS | Allow | Compatible | Compatible | Compatible
Disallow | Compatible | Compatible | Compatible
FactoryTalk View Studio 6.10 or later on a 64-bit OS | Allow | N/A | N/A | N/A
Disallow | Compatible | Compatible | Incompatible
6.10 or later MER | FactoryTalk View Studio 6.10 or later on a 32-bit OS | Allow | Compatible | Compatible | Incompatible
Disallow | Compatible | Compatible | Incompatible

## See also

Quick start steps for running an application

Start an application

Start an application automatically on a MobileView terminal or a personal computer using parameters