Error: System.DllNotFoundException

This error message is shown when Tekla Structures cannot start because a required .dll file is missing or corrupted in your Windows operating system.

For more information, see Tekla Structures does not start: error System.DllNotFoundException.

Error: System.Runtime.Remoting.RemotingException

The following error message is shown:

System.Runtime.Remoting.RemotingException: Failed to connect to an IPC Port: The system cannot find the file specified.

This message is shown when the required redistributable packages for your Tekla Structures version are not installed on your computer.

See which additional necessary software components are needed for your Tekla Structures version in the hardware recommendations. Install any missing redistributable packages.

Error: APPCRASH TeklaStructures.exe ntdll.dll

The following error message is shown:

Problem Event Name: APPCRASH
Application Name: TeklaStructures.exe
Fault Module Name: ntdll.dll

Usually, this error message is shown when other software prevents Tekla Structures from running correctly. For more information, see Tekla Structures product bulletin: Other software hooking to Tekla Structures.

This error message might also be shown if there are problems with the model. Use the Diagnose & repair commands to check and to repair errors and inconsistencies in the structure of model objects and the library database. See Diagnose and repair the model.

Sometimes, installing the latest Tekla Structures service pack might resolve the problem. See Install Tekla Structures service packs.

Find information about errors when Tekla Structures does not show an error message

If Tekla Structures does not start or stops working without showing an error message, do these steps to find information about the error.

In Windows, open the Event Viewer app.
Browse to Windows Logs > Application.
Look for an event that has Error in the Level column.

The General and Details tabs show information about the error.
If you want to send the error messages when you contact Tekla Structures support, save the error messages.
1. Select one or more lines.
  
  To select multiple lines, hold down Ctrl or Shift, then click.
2. Right-click the selected lines, then select Save selected events.

General troubleshooting steps

You can also try these general troubleshooting steps:

Restart your computer.
Restart Tekla Structures.

If the Tekla Structures app has stopped responding, you might have to end the task in the Windows Task Manager before you can start Tekla Structures again.
Install the latest Tekla Structures service pack for your version of Tekla Structures. See Install Tekla Structures service packs.
If a newer service pack is not available, uninstall and re-install the same version of Tekla Structures. See Uninstall Tekla Structures.

Questions and actions for troubleshooting


Question	Action
Is your operating system compatible with the Tekla Structures version that you installed?	See the supported operating systems for your Tekla Structures version in the hardware recommendations.
Did the error message appear after you installed a specific Tekla Structures service pack?	Install the latest service pack. See Install Tekla Structures service packs. If a newer service pack is not available, uninstall the current service pack and install an earlier service pack. See Uninstall Tekla Structures.
Are the required redistributable packages for your Tekla Structures version installed on your computer?	See which additional necessary software components are needed for your Tekla Structures version in the Tekla Structures 2024 hardware recommendations. Install any missing redistributable packages.
Is the error related to your computer's performance?	Ensure that your computer meets the requirements in the hardware recommendations. See the recommended hardware for Tekla Structures workstations in the hardware recommendations.
Are the latest versions of drivers, such as graphics card drivers, installed on your computer?	Compare the versions of the drivers that are installed on your computer to the latest versions from the manufacturer. If necessary, upgrade your drivers.
Are the latest Windows updates installed on your computer?	Check if Windows updates are available and install any missing updates. For instructions, see Update Windows.
Are antivirus programs stopping Tekla Structures from running?	Check the settings in your antivirus software or ask the IT personnel at your company for assistance.
Is malicious software or unlicensed third-party software installed on your computer?	Use your security software to scan for and remove malicious software. Uninstall any unlicensed third-party software. Ask the IT personnel at your company for assistance.
Are you having the same problem in more than one version of Tekla Structures?	If more than one version of Tekla Structures is not working correctly, include this information when you contact Tekla Structures support.
Did you open a model that was created using a different version of Tekla Structures?	We recommend that you finish working on the model using the same version of Tekla Structures that you used when you created the model. You can have multiple versions of Tekla Structures installed on your computer at the same time.
Did you recently install other software on your computer?	Check if other software is preventing Tekla Structures from running correctly. See Tekla Structures product bulletin: Other software hooking to Tekla Structures. Ask the IT personnel at your company for assistance.
Did you recently install content from Tekla Warehouse?	Delete the content and check if the error still occurs.
Are you working in a large model?	See Tips for large models.
Are you working in a multi-user model?	See Remove inconsistencies from a multi-user database.
Are you working in a shared model using Tekla Model Sharing?	Check the prerequisites for Tekla Model Sharing in Tekla Model Sharing.
Does the error occur only in a specific model?	Use the Diagnose & repair commands to check and to repair errors and inconsistencies in the structure of model objects and the library database. See Diagnose and repair the model.
Do other users see the same error message when they open the same model?	Ask another user to try opening the model.
Does the error only occur in models that were created using a specific model template?	Ask the person who maintains the model template to use the Diagnose & repair commands to check and to repair the model template. See Diagnose and repair the model.

Troubleshooting the Tekla Structures app