Hi,
I regret for the inconvenience caused. I was able to reproduce the issue you have reported. This issue is being worked on, with high priority, by our developers and will be cleared at the earliest.
Please try this as shown below. The following steps are in the assumption that you are using the Syncfusion Essential Studio 4.2.0.37.
1) I have attached here a CopyCore.bat file, that copies the Syncfusion.Core from the precompiledasemblies folder to the project output folder. Copy this file to the ProjectDirectory(The folder where the project resides).
2) Open the project properties. In the BuildEvents tab, enter the Post-build event command line as,
call "$(ProjectDir)copycore.bat" "$(TargetDir)"
This will copy the Syncfusion.Core to the project output directory. Please refer the image attached.
Please try this and let us know if this helps.
Thank you for your interest in Syncfusion Essential Studio.
Regards,
Nanda
BuildEvent.zip