Opening existing project in Delphi 10.2 reports error that "Class TBarSeries not found."

This is a strange one, and is related to the Delphi IDE environment, but I'm hoping someone has some insight, cos I'm at a loss.

Basically, the problem is that I'm now in a situation where any project I create that uses a TChart with a TBarSeries gives me the "Class TBarServices not found" error when I re-open it from a fresh start of the IDE.

As an example, currently if I do the following:

Create a new VCL forms application,
add a TChart component to the form,
edit the chart through the designer and add a Series, choosing Bar as the type.
Build the project,
run it, everything is fine.
Close the IDE and restart it.
Open the previously saved project. Immediately get the Error Reading Form message about Class TBarSeries not found.

But if I then:

Close the broken project without saving, and leave the IDE running.
Create a new VCL form with or without a project,
add the TChart and bar Series to the form,
close the form/application without saving.
Reopen the previously saved project that threw the error. No error any more.

Creating a new TForm with a TChart and TBarSeries is changing the Delphi IDE in some way that is not persistent, so that the next time the IDE is started, those projects no longer load properly.

I have included VCLTee in the Unit Scope Names, but the Enterprise version of Delphi 10.2 does not include the source for these components, so there are no additional paths I can add to the Library Path.

Once I have created a new form and set up the chart, everything is fine with any project that uses the TBarSeries so long as I don't close the IDE, so that's the workaround I currently employ.

Solution

Do you use DevExpress? I had the same problem when DevExpress Printing System for DBTeeChart was installed. Probably DevExpress uses old version of TeeChart different than this installed by you. I just disabled this DevExpress Printing System and now it's OK.