The news comes as a surprise to industry observers, some of whom were reporting last week that CBS has already ordered the show for its fall season.
"There were elements on the pilot that didn't work out," she said. "We tried to work out about redoing the pilot. That's not happening right now. Sometimes you run into these kind of issues and you hope they can resolve themselves in that time frame."
20th Century Fox TV, which owns the show, was reportedly unwilling to rewrite the pilot and will consider shopping it to other networks.
"I'm heartsick," Tassler said.
2014: The Year in Music [PHOTOS]