By definition, a writer's block is a condition, primarily associated with writing, in which an author loses the ability to produce new work. The condition ranges in difficulty from coming up with original ideas to being unable to produce a work for years. Throughout history, writer's block has been a documented problem. - Wikipedia
Writer's block.
It is every self-respecting writer's nightmare.
This is especially true if you make a living out of writing. Just as I do.
There are quite a few ways to beat a writer's block.