I have deleted the default company I created. Every time I tried to open the MS Dynamics AX 2012 Application, it shows a Login error. Please see below screen shot:
You have to change the configuration to point to a valid company. It’s usually done in the AX configuration utility. If you’re using configuration saved in Windows registry, just run the tool and modify the config. If you use a configuration file (.axc), open it in the utility, modify the config and save it back to the file.