I have created a WordPress plugin. while i am going to activate the plugin facing following error:
The plugin generated 250 characters of unexpected output during
activation. If you notice “headers already sent” messages, problems
with syndication feeds or other issues, try deactivating or removing
this plugin.
I have checked for white spaces and characters before the PHP starting tag and closing tag.
But error remains.
Try to remove all comment lines and fill the white spaces in the entire program code. This may help.