I ran into a similar problem (Rad Studio 10.4.2 with patches as of today's date, and TeeChart Pro v2021.31 with Source) The OP's solution didn't work for me (i.e. I tried deleting the .dproj file to create a new one). It seems to me that what is happening is that the (VCL) project was somehow ending...

Just to follow up with the solution to this problem, in case anyone else runs into it: I uninstalled TeeChart completely, then reinstalled. This time, when TeeRecompile executed, I created a TeeChart Source Code Folder outside the Program Files hierarchy.... and let TeeRecompile go about its busines...

TEESRCPATH is defined in the environment variables on my system too. teechart_env.png The problem seems to be that when I build my project, Delphi wants to recompile VCLTee.TeeHtml.pas for some reason, even though this file has not been changed. The compilation then fails because the user doesn't ha...

Looking at the Library paths, I see this:

Are you saying I need to add another line, that points to Source\VCL ?

Also, why is the $(TEESRCPATH) flagged as an invalid path by the IDE?

I have the following additional information: If I give the (Windows) user rights to write to directory "C:\Program Files (x86)\Steema Software\Steema TeeChart Pro VCL FMX Source Code 2020.31\Source\VCL\", then the problem goes away... it looks like "something" is attempting to compile the DCU straig...

I think I figured out what causes the second error and a workaround, but it is clearly a bug: [dcc32 Error] VCLTee.TeeSpline.pas(634): E2010 Incompatible types: 'TTeeFunctionClass' and 'class of TSmoothingFunction' I think I will raise a support case on Monday as I'm not getting anywhere with the fi...

Starting with a clean Windows 7 machine, I installed RAD Studio 10.4.2 from scratch, also downloaded and installed TeeChart Pro v2021.31 on this machine. This made no difference - I still get the same error message when I try to compile the project: [dcc32 Fatal Error] VCLTee.TeeHtml.pas(933): F2039...

Rad Studio Sydney 10.4.2 TeeChart VCL FMX SOURCE-2020.31 When building an older project that has a TeeChart in it, I am getting the following error: [dcc32 Fatal Error] VCLTee.TeeHtml.pas(934): F2039 Could not create output file 'C:\Program Files (x86)\Steema Software\Steema TeeChart Pro VCL FMX Sou...

Awesome, thank you for confirming!

Does the Steema VCL release from November 12, 2020 (Build v2020.31.201112) support RAD Studio 10.4.2?