Unable to Open Project

[Mallen52]

I am unable to open or download my app project. The only thing that happens when I click the project I want to open is a loading message that disappears after a very brief moment, so I am not sure how to begin diagnosing this problem. Could I get some assistance with this? I really don't want to restart my entire project.

Thanks

[Anke]

@Mallen52

I am unable to open or download my app project.

• How big is the app?
• How many files are in the assets?
• What file types?
• Was the project imported from another builder?
• Has the problem existed from the beginning? If not, since when?

[ABG]

This URL allows you to open AI2 to the Project List, without opening any project.
http://ai2.appinventor.mit.edu/?autoload=false
From that list, you can request Exports of Projects without trying to open them.
Upload the troublesome .aia here.

[Mallen52]

KingPong.aia (1.3 MB)
Here is the .aia file.
This project was not imported from another builder, and this is the only project I am experiencing this problem with.

[ABG]

I did two surgeries, the first unnecessary, as it turns out.

I used IrfanView to shrink the Logo.png by a factor of 10 by 10 = 100.

I set the Last Opened Screen to Screen1. It was set to Screen2, which does not exist.

That fixed the loading problem.

Did you apply surgery to this aia file?
KingPong.aia (68.2 KB)

[ABG]

While I'm in your project, I see a very unusual way of using TinyDB:

You have 6 instances of TinyDB,

and you change their Namespaces all over the place, but you never store or retrieve any tags/values in them.

What were you thinking?

[Mallen52]

Thank you so much for the fix!

I am using the TinyDBs as variables that I am later concatenating and send to a microcontroller using bluetooth. This is my first ever project using this software, so if this is not the best way to do this I would appreciate the advice>

[ABG]

FAQ Section: TinyDB

Introductory TinyDB AI2 Help page - MIT Simplest possible TinyDB sample (Phone numbers) - ABG Bugs Intermediate Book Collection in TinyDB(Hossein) Contact Dictionaries in TinyDB - ABG How to save Max Scores on TinyDB - ABG Student names and Emails - TIMAI2 The Tiniest TinyDb Tutorial (Richard) - needs refurbish Advanced TinyDB Namespace Recovery - KIO4 etc. TinyDB after uninstall of an APP Save Base64 of Image Files in TinyDB using extension - Juan Antonio Simulate Multiple Tin…

TinyDB is typically used for data persistence across Screen switching and across runs of the project.

The NameSpace is the XML file name used for storage of tags and values in each TinyDB instance.

Since you only have one Screen, and you are not accumulating data for subsequent analysis, you might as well use global variables.

(I notice you don't have a single global variable. Did you miss that chapter?)
http://www.appinventor.org/bookChapters/chapter16.pdf
from
http://www.appinventor.org/book2

[ABG]

I notice you are sending data through BlueTooth, but not receiving any.

It might be a good idea for you to post your sketch code here too.

[Mallen52]

Thank you for the advice. That definitely seems better. I'll try to figure out the rest myself, but if I run into any other problems, I'll let you know!

[mabsMIT]

Hi, I run an organization where we have about 85 teams creating projects. This one came up this weekend and I could use some help. Their .aia won't load. I downloaded it and also tried to load it, but I get an error with a popup to report a bug. Could you possibly take a look and give me some advice? The students really do not want to recreate their work.
It_takes_a_town.aia (7.9 KB)

[TIMAI2]

Try this, it is probably suffering from the lastopened bug

It_takes_a_town.aia (7.9 KB)

[mabsMIT]

Thank you it's working!!!!!!!!!!
How exactly did you fix this in case it comes up again?

[mabsMIT]

I guess what are the students doing to cause the error?

[TIMAI2]

See here

Project corrupted after deleting screen – cannot open project

This sounds like the lastscreenopened bug. Export your affected aia, use this url to avoid opening any projects: https://ai2.appinventor.mit.edu/?autoload=false Open up the aia project with a zip program and then open the projectproperties file in the youngandroidproject folder in a text program like notepad. Change the line lastopened= to lastopened=Screen1 save the file back into the aia project and try again. Alternatively, upload your aia project here and someone can do that for you.

[mabsMIT]

@Project corrupted after deleting screen – cannot open project

This sounds like the lastscreenopened bug. Export your affected aia, use this url to avoid opening any projects: https://ai2.appinventor.mit.edu/?autoload=false Open up the aia project with a zip program and then open the projectproperties file in the youngandroidproject folder in a text program like notepad. Change the line lastopened= to lastopened=Screen1 save the file back into the aia project and try again. Alternatively, upload your aia project here and someone can do that for you.

Thank you!