# Nova-bb, rcross don't work (Concrete abstractions) **URL:** \ **Category:** General\ **Tags:** drracket\ **Created:** [December 29, 2023, 3:49pm UTC](https://racket.discourse.group/t/nova-bb-rcross-dont-work-concrete-abstractions/2627 "2023-12-29T15:49:15Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![Kartoffel](https://yyz2.discourse-cdn.com/free1/user_avatar/racket.discourse.group/kartoffel/32/1620_2.png) [@Kartoffel](https://racket.discourse.group/u/Kartoffel)\ **Post date:** [December 29, 2023, 3:49pm UTC](https://racket.discourse.group/t/nova-bb-rcross-dont-work-concrete-abstractions/2627/1 "2023-12-29T15:49:15Z")
[DrRacket Installation and Setup (umn.edu)](https://www.d.umn.edu/~tcolburn/cs1581/labs/setup/) ---
**Author:** ![Kartoffel](https://yyz2.discourse-cdn.com/free1/user_avatar/racket.discourse.group/kartoffel/32/1620_2.png) [@Kartoffel](https://racket.discourse.group/u/Kartoffel)\ **Post date:** [December 29, 2023, 3:53pm UTC](https://racket.discourse.group/t/nova-bb-rcross-dont-work-concrete-abstractions/2627/2 "2023-12-29T15:53:56Z")
Hello, I am trying to follow the intructions, [DrRacket Installation and Setup (umn.edu)](https://www.d.umn.edu/~tcolburn/cs1581/labs/setup/) but seems it doesn’t work anyway. Here is what I should see after installation. [DrRacket Installation and Setup (umn.edu)](https://www.d.umn.edu/~tcolburn/cs1581/labs/setup/) : ![image](https://global.discourse-cdn.com/free1/uploads/racket/original/2X/d/d46999e38ff72fad4c64bcb7a4fbdf4fabca3a05.jpeg) This is what I can see after Update: ![image](https://global.discourse-cdn.com/free1/uploads/racket/original/2X/6/6d2c867d4e809ade6fe821738911b6f41479eea4.png) Then I do everything as described – I think: - Download the following file to your desktop: [quilting.scm](https://www.d.umn.edu/~tcolburn/cs1581/labs/setup/code/quilting.scm). (If it displays in your browser as Racket source code, use the browser's **Save As** option to save it.) - Confirm that the language setting is still **Racket**. - Click **File** in DrRacket's menu bar and select **New Tab** to create two "Untitled" tabs in DrRacket. - Click **File** and select **Open...**. - Select the **quilting.scm** file you just downloaded and click **Open**. The file will be opened in one of the tabs in the definitions pane of the DrRacket window. - Click **Run**. ---
**Author:** ![Kartoffel](https://yyz2.discourse-cdn.com/free1/user_avatar/racket.discourse.group/kartoffel/32/1620_2.png) [@Kartoffel](https://racket.discourse.group/u/Kartoffel)\ **Post date:** [December 29, 2023, 3:54pm UTC](https://racket.discourse.group/t/nova-bb-rcross-dont-work-concrete-abstractions/2627/3 "2023-12-29T15:54:48Z")
![image](https://global.discourse-cdn.com/free1/uploads/racket/original/2X/0/0d9740590f0d0e220354ea1161379b3a659348f1.png) As I type nova-bb, this happens: ![image](https://global.discourse-cdn.com/free1/uploads/racket/original/2X/7/7fb6a59bfb832d74fd816bf5ed2b72858ec9d7ca.png) Do you know where is the mistake please? ---
**Author:** ![soegaard](https://yyz2.discourse-cdn.com/free1/user_avatar/racket.discourse.group/soegaard/32/19_2.png) [@soegaard](https://racket.discourse.group/u/soegaard)\ **Post date:** [December 29, 2023, 3:57pm UTC](https://racket.discourse.group/t/nova-bb-rcross-dont-work-concrete-abstractions/2627/4 "2023-12-29T15:57:25Z")
Save your "untitled 2" file as something like "my-program.rkt" in the same folder you put "quilting.scm". Then try: ```scheme #lang racket (require "quilting.scm") nova-bb ``` ---
**Author:** ![Kartoffel](https://yyz2.discourse-cdn.com/free1/user_avatar/racket.discourse.group/kartoffel/32/1620_2.png) [@Kartoffel](https://racket.discourse.group/u/Kartoffel)\ **Post date:** [January 1, 2024, 2:48pm UTC](https://racket.discourse.group/t/nova-bb-rcross-dont-work-concrete-abstractions/2627/7 "2024-01-01T14:48:41Z")
I was able to follow the instructions and here is a first attempt in developing a Spaceship: ![image](https://global.discourse-cdn.com/free1/uploads/racket/original/2X/8/8d32b82882997b09ecf3062fdd19a8e7129d21df.png) I would like now to make e 2D videogame where the spaceship can move right and left. Is it possible to get a first help here? ![image](https://global.discourse-cdn.com/free1/uploads/racket/original/2X/9/98dd1268ba8ed5375a14b6947b9046c3e3583628.png) ---
**Author:** ![soegaard](https://yyz2.discourse-cdn.com/free1/user_avatar/racket.discourse.group/soegaard/32/19_2.png) [@soegaard](https://racket.discourse.group/u/soegaard)\ **Post date:** [January 1, 2024, 7:55pm UTC](https://racket.discourse.group/t/nova-bb-rcross-dont-work-concrete-abstractions/2627/8 "2024-01-01T19:55:25Z")
The prologue of "How to Design Programs" ends in an animation of a rocket. [https://htdp.org/2023-8-14/Book/part\_prologue.html](https://htdp.org/2023-8-14/Book/part_prologue.html) ---
**Author:** ![Kartoffel](https://yyz2.discourse-cdn.com/free1/user_avatar/racket.discourse.group/kartoffel/32/1620_2.png) [@Kartoffel](https://racket.discourse.group/u/Kartoffel)\ **Post date:** [June 12, 2024, 2:54pm UTC](https://racket.discourse.group/t/nova-bb-rcross-dont-work-concrete-abstractions/2627/9 "2024-06-12T14:54:21Z")
Excuse me. I would like to open a Racket project from Desktop but everytime I am asked "how I would like to open it", "with which application". Is there a way to fix it? Usually Windows displays "use this application always to open that kind of files" but in this case this option is missing. Is it possible to fix that? ---
**Author:** ![soegaard](https://yyz2.discourse-cdn.com/free1/user_avatar/racket.discourse.group/soegaard/32/19_2.png) [@soegaard](https://racket.discourse.group/u/soegaard)\ **Post date:** [June 12, 2024, 8:04pm UTC](https://racket.discourse.group/t/nova-bb-rcross-dont-work-concrete-abstractions/2627/10 "2024-06-12T20:04:15Z")
Windows associates each file type with an action. In order to google how to change them, use the term "file association". Try searcning either on Google or YouTube for: "How to Change File Associations in Windows"