Problem:
The following errors occur while adding/issuing a card in Indeed CM:

Encryptor not found

and (or) 

Specified procedure not found

Solution: 
Most probably, the root cause is that the name of the server where Indeed CM is installed, contains “_” character.

According to the Microsoft article, cookie files are blocked on ASP pages if the server name contains characters that are not supported by DNS (Domain Name System) service. For example, underscore (“_”) character is one of those. Such behaviour is a distinct feature of the product.
To circumvent the problem, use one of the following:

• Change the server name, using alphanumeric characters only.
• Go to the server using its IP address, not name.

Note: After the server is renamed, the Microsoft Internet Information Server (IIS) configuration might require corresponding modifications.