This article applies to Microsoft Dynamics NAV for all countries and all language locales.
When you run the Microsoft Dynamics NAV Application Server (NAS) with multiple sessions in Microsoft Dynamics NAV 2013, you receive the following error message:
Could not load file or assembly.
A supported hotfix is available from Microsoft. There is a "Hotfix download available" section at the top of this Knowledge Base article. If you are encountering an issue downloading, installing this hotfix, or have other technical support questions, contact your partner or, if enrolled in a support plan directly with Microsoft, you can contact technical support for Microsoft Dynamics and create a new support request. To do this, visit the following Microsoft website:
https://mbs.microsoft.com/support/newstart.aspx You can also contact technical support for Microsoft Dynamics by phone using these links for country specific phone numbers. To do this, visit one of the following Microsoft websites:
https://mbs.microsoft.com/customersource/support/information/SupportInformation/global_support_contacts_eng.htmIn special cases, charges that are ordinarily incurred for support calls may be canceled if a Technical Support Professional for Microsoft Dynamics and related products determines that a specific update will resolve your problem. The usual support costs will apply to any additional support questions and issues that do not qualify for the specific update in question.
How to obtain the Microsoft Dynamics NAV hotfix or update files
After you request a Microsoft Dynamics NAV hotfix, a hyperlink will be sent to you in an e-mail.
The e-mail will contain a hyperlink and a password. You can use the hyperlink to download the Microsoft Dynamics NAV hotfix or the update files. When you click the hyperlink, the File Download – Security Warning dialog box opens. Then, you are prompted to run, to save, or to cancel the download.
If you click Run, the files start the download and the extraction process. You must specify a folder for the new files, and then provide the password.
If you click Save, you must specify a path for saving the compressed file. When you open the file that you saved, you are prompted to specify a path for the files. Then, you must provide the password provided in the e-mail.
If you click Cancel, the download process stops.
How to install a Microsoft Dynamics NAV platform hotfix
The Microsoft Dynamics NAV platform hotfixes are made available as single files. To install a Microsoft Dynamics NAV hotfix, you must replace the existing Microsoft Dynamics NAV installation files with the hotfix files. To do this, follow these steps.
Step 1: Replace the files in the Microsoft Dynamics NAV Server installation
In the Microsoft Dynamics NAV Server installation, replace the files by using the hotfix files.