Junk characters bcoz of Writeln()

When i am trying to insert a new paragraph using Writlen() some junk characters like

)d:h@^ are getting inserted.

I tried using Writeln("") as well as Writeln(" "). Both are inserting junk characters.

Whether there is any method to solve this problem?

That is because you are using evaluation version.

See https://docs.aspose.com/words/net/licensing/ for more information about evaluation version limitations.