Delphi XE - F1027 Unit not found: 'System.pas' or binary equivalents (.dcu) upon Activation of trial version

I开发者_开发知识库 just purchased the full version of Delphi XE Architect after using the trial version for 30 days. I can't build anything, every time I go to build a project I get the error.

[DCC Fatal Error] MegaMainPrj.dpr(1): F1027 Unit not found: 'System.pas' or binary equivalents (.dcu)

A quick google said that the library paths were a problem and I compared what was given (in a previous stackoverflow question) with what I had in the registry, and it was identical.

What could be causing this?

EDIT: Immediatly after I get this error message the entire IDE crashes.

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add this : $(BDSLIB)\win32\release;

to your library path .

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Make sure you have the environmental variables set properly (Tools->Options->Environmental Variables from the IDE's main menu):

BDS=D:\Embarcadero\RAD Studio\8.0
BDSCOMMONDIR=C:\Users\Public\Documents\RAD Studio\8.0
PLATFORM=Win32

These should all be set in the System Variables section, and should have been added by the installer. (Obviously, they should point to the installation location of your XE installation - mine is installed in D:\Embarcadero\RAD Studio\8.0, as you can see.)

EDIT: I see in your comment you installed in C:\Program Files - bad idea if you're running Windows Vista or Win7 or higher. You should try installing in a different location. You can also try running the IDE as Administrator (right-click shortcut in Start->All Programs->Embarcadero->RAD Studio XE->Delphi XE, choose "Run as Administrator" from context menu). Does this change anything?

Also, you can open a free support case at Embarcadero for installation-related issues. I'd first try reinstalling in another location (running the install as Administrator, putting it in another folder, and installing for all users); if that doesn't work, open a support case. You can also post to the Embarcadero Delphi Installation forums - you'll need to have already created a user account there first to log in.

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C:\Embarcadero\RAD Studio\9.0\lib\win32\release

and

C:\Embarcadero\RAD Studio\9.0\lib\win32\debug

Both of these path have been to add in Delphi XE2 from IDE <<Tools->Options->Library->Library path>>

It's OK?

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Goto Tools->Options->Library->Library path

and add $(BDSLIB)\win32\release

This worked in Delphi 10.2

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When compiling using the command line compiler, so not from within the IDE, you can also get this error when the name of the build configuration is not "debug" and not "release".

It seems that, when using the command line compiler, it tries to find its dcus in a path under BDSLIB that it constructs using the configuration name. I had this happening when using a configuration named ReleaseHA. Note: it was not a sub configuration under "release", but an extra configuration besides "debug" and "release".

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Sometimes this error message occurs when we have duplicate libraries included.

Make sure that:

Tools->Options->Environmental Options->Library

and

Project->Options->Directories/Conditionals

Don't include the same paths...

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Running as Administrator worked for me.