Please confirm which version of b2evolution you use.

@fplanque wrote earlier:

Please confirm which version of b2evolution you use.

I'm using b2e 6.10.1 version.

Regards,
Abhijit

@abhijitkn I guess you copied a skin folder with git branch suffix -master like bricks_skin-master. Please try to rename the folder to bricks_skin, it must works, otherwise please show us screenshot and your folder name and class name in the file _skin.class.php(it must be class bricks_Skin extends Skin). Thanks.

Thank you, Yura.
The issue was related to suffix '-master'.
Why not to add bricks_skin under repository?

@abhijitkn Thanks for reminding us that it should be added. Will be done asap.