The error most likely indicate that there was some corruption in memory at the Web Server (the one that host Weblink), possible another application was trying to access a memory section that was already being use by Weblink. Another possible cause might be corruption of the Net components use by Weblink.
The common solution will be to restart the IIS service.
For troubleshooting purposes, review the IIS log files (default location is %SystemDrive%\inetpub\logs\LogFiles)
Also review the event viewer log files application and system they might indicate if there is an issue with net framework installation in which case you can try to repair the component or uninstall/reinstall.
From your screen-print , the system is using Weblink version 8.2.2 maybe upgrade to Weblink 9 which uses net 4.0