# Error: There was a problem loading the activation library. Code 7

The following error messages may occur when upgrading from an older version of Lumerical software. Typically it is possible to simply install the new version without manually un-installing the older version first. However, in some cases the automatic un-install fails, resulting in these error:

This can be resolved by:

1. Close the error message by selecting ‘NO’.

2. Open the Control Panel > Programs and features, and un-install Lumerical (ie. Ansys Lumerical)

3. Go to C:\Program Files\Lumerical\ and ensure the product folder (i.e. v202) has been removed. If it is still present, delete the entire folder.