I created a library project, and I created an actionscript class under a package. Then I created a flex project and added my previous library project to this flex project through ‘Build Path’. When I tried to run the application after importing the class as a custom component, I saw the error :could not resolve to a component implementation before run.

I did a small mistake, which I identified and fixed. While importing a library project, do make sure that you are also adding the SWC file of that library project in the, “Library Path’ of your main flex project.

The error was gone and the application run successfully after this.

Happy Coding!!!!

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I am getting the Error;
Could not resolve to a component implementation.

So please let me what is going wrong.
I am stuck in this problem form last 3 days.
I searched a lot but didn’t got any response.
So please Help me out.
I am using Flah Builder 4
SDK 4
Flash Player 10.2

Ok, my bad: I copied the com and org folders into the root for the project, rather that the src folder.

“Could not resolve to a component implementation.”

Here’s what I did (Using Windows Vista):
1) Created an empty Flex project in Eclipse v 3.4.2 (w/ Flex plugin)
2) Copied the com and org folders to the project’s root directory
3) Refreshed the project (folders showed up ok)
4) Added the xmlns:rs=”com.rubenswieringa.book.*” namespace attribute to the mx:Application tag

At this point, nothing big and I could compile and run.

5) Added the rs:Book tags from the simple.mxml file

Then I received the error. Does this have something to do with Windows permissions on the folders maybe?