The Martin Luther King Jr. Memorial probably won't be ready for the 50th anniversary of the March on Washington later this month.
Workers had been removing a disputed inscription from the memorial, but an architect working on it says a contracting problem has stalled the project.
Architect Ed Jackson Jr. tells The Associated Press the side of the memorial's "Stone of Hope" is unfinished because the main contractor doesn't have insurance to complete sandblasting to refinish the stone surface.
Workers accidentally stained it a brownish color Friday during a blasting process that was different than one that had been originally planned.
National Park Service spokeswoman Carol Johnson says the work will likely stop for the anniversary of the march on Aug. 28 and resume later.