Some contractors on New Mexico’s Spaceport America commercial launch site have worked for weeks or months without getting paid, and their patience is wearing thin, the Las Cruces Sun-News reports.

One subcontractor, Bowers Electric, recently walked off the job, saying it hadn’t been paid since January. Another contractor described the construction project as a “nightmare.” “We just want to go and finish and get the hell out of there,” he said.

Christine Anderson, executive director for Spaceport America, blamed the problem on a complex invoice approval process that routes paperwork through a series of state agencies. Other officials say the situation was exacerbated by the changeover in gubernatorial administrations at the start of the year.