The blocks area did not load properly. Changes to the blocks for screen 4549877370519552_Screen1 will not be saved.
Dear @Rizky_Wahyudi , the name that you assigned to Screen1 is pretty weird.
Screen1 is the root of any application, it cannot be changed. If you refer to the "title" of Screen1, please try to, anyway, change it to a shorter name (or leave it as Screen1 at all).
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.
If you require repair assistance, upload the aia file here.
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same type of error is shown to me please help i do but not working
See
This usually indicates something is corrupted either in the designer or the blocks. Instead of propagating the corruption by allowing you to make undefined changes to the workspace, we make it effectively read only. If you can share your project then someone can look at it and repair it for you.