This issue can be occurred when the Syncfusion controls in toolbox version is different from the GAC assemblies installed version in the machine. At that moment, it will throw the exception as “There is already a reference to the Syncfusion.Tools.Windows component in the project”.
If the GAC assemblies were not properly configured or previous version of Syncfusion assemblies were not removed properly from the machine, the issue can be occurred.
This problem can be resolved by installing the GAC assemblies properly. To install the GAC assemblies, please refer the below UG document,
To ensure whether the Syncfusion controls are configured properly for the .NET Framework version, please follow the below steps,
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