Error: Error while compiling resources?

[SirLucifer]

So, I have a project, originally written and compiled using FPC 2.3.1. Yesterday I got a recommendation, elsewhere in these forums, to use FPC 2.5.1 that would better suite my needs.
So, I uninstalled Lazarus, but left the settings, installed Lazarus with FPC 2.5.1, rebuilt it a few times to include some needed components.
Then, I opened my old project, built it... And it went right through the compiler (as it should). So, I thought I indicate this step up in compiler by increasing the version resource.
Here's where it all stops working!  Now, I get an "Error: Error whild compiling resources" every time I try to build the project.
I've managed to see that it's not the .rc that causes the problem, but a .or
What's a .or?
And how do I make this problem go away?

I just noted that Quick Compiling the project works without a hitch...

Regards

[Leledumbo]

What's a .or?

As far as I can see, it looks like a compiled .rc. You'll get it for every resource in {$R} directive.

And how do I make this problem go away?

Depending on the contents of .rc file, you may try to remove it first.