Question: I have SDK version 25, when i import a project in android studio this error occurs. 

> 
> "Install missing platform(s) and sync project".
> 
> 
> 

If I click this link, I get another error, which says:

> 
> "The following packages are not available: - Package id
>  platforms;android-23".
> 
> 
> 

[sdk error](https://i.stack.imgur.com/hY1P2.png) 

[my SDK version](https://i.stack.imgur.com/8e89N.png)

Answer: 
First, uninstall any versions of OpenCV you may have installed. If you installed using `pip`:

```
sudo pip uninstall opencv-python

```

Next, try installing OpenCV using your Linux distro's package manager. For Ubuntu/Debian, this is:

```
sudo apt-get install libopencv-dev python-opencv

```
Downgrade the python version from 3.9.13 to 3.8.10

```
conda install python=3.8.10

pip install opencv-python==4.5.2.54

```

worked for me.