This error will occur if the PM-Security application files cannot be found.
Navigate to the HSoft\Apps folder.
Check if the VclHsXX.dll file exists (or VclHsSqlXX.dll for SQL users), where XX represents the particular year of the module you're trying to access.
For example, if the error occurs in HandiTax 2019, check the HSoft\Apps folder for the file VclHs19.dll file. For SQL, it will be VclHsSql19.dll.
If the files are missing, please raise a new case with support online and reference the title of this article.