Four types of problem are there try out them you will get out of that issue....
1)First, make sure that the required product is installed on your machine. For example, if you develop a WinForms project ensure that our WinForms controls are installed. For this, run our installer in Modify mode and check whether WinForms controls are selected:
2)If you installed Visual Studio after the installation of our products, re-run our installer in Repair mode to register our toolbox items for that Visual Studio.
3)Devexpress require .NET Framework 3.5 or higher. WPF and Silverlight controls require .NET Framework 4.0 or higher. All controls of version 13.1 and higher require .NET Framework 4 or higher. To check what target framework is set for your project, navigate to the project properties.
1)First, make sure that the required product is installed on your machine. For example, if you develop a WinForms project ensure that our WinForms controls are installed. For this, run our installer in Modify mode and check whether WinForms controls are selected:
2)If you installed Visual Studio after the installation of our products, re-run our installer in Repair mode to register our toolbox items for that Visual Studio.
3)Devexpress require .NET Framework 3.5 or higher. WPF and Silverlight controls require .NET Framework 4.0 or higher. All controls of version 13.1 and higher require .NET Framework 4 or higher. To check what target framework is set for your project, navigate to the project properties.
4)try to repairs tools like this
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