E: Malformed line 1 in source list/etc/apt/sources.list.d/playonlinux.list [duplicate]

This question already has an answer here:

  • How do I remove a malformed line from my sources.list? 9 answers

this is showing in terminal. An error icon is also showing in taskbar like this in red colour – E:Malformed line 1 in source list/etc/apt/sources.list.d/playonlinux.list E:The list of sources could not be read.