Misapplication of a federal law meant to stem the theft of American technological know-how has likely made it impossible for several Chinese scientists to attend a NASA astronomy conference -- a ban criticized by Chinese officials and the law's author.

One of those banned is Yale University post-doctoral student Ji Wang, who had planned to present data from the now-defunct Kepler spacecraft at the event. NASA head Charlie Bolden admitted the agency had made a mistake on Thursday, a change of heart likely too late to help, said Alan P. Boss, a member of the Carnegie Institution for Science and co-chair of the conference.

"The efforts of NASA's Ames Research Center to ensure that our Chinese astronomer colleagues will be able to attend the Second Kepler Science Conference have been halted by the fact these approvals must be entered into a computer system at NASA HQ in Washington DC," Boss told FoxNews.com.

"Because of the ongoing federal government shutdown, there is no one at NASA HQ who can complete the approval process."

"The ability of scientists to attend an open scientific meeting about the spectacular results produced by NASA's Kepler Space Telescope is another likely fatality of the failure of the U.S. Congress to enact a federal budget for FY2014," Boss added.

In a Thursday e-mail to NASA staff seen by FoxNews.com, space agency chief Charlie Bolden blamed "mid-level managers" and said his office was looking to correct the mistake.

"In performing the due diligence they believed appropriate following a period of significant concern and scrutiny from Congress about our foreign access to NASA facilities, meetings and websites, [they] acted without consulting NASA HQ," Bolden wrote.

- NASA's Charlie Bolden

"Upon learning of this exclusion, I directed that we review the requests for attendance from scientists of Chinese origin and determine if we can recontact them immediately upon the reopening of the government to allow them to reapply."

The ban had been widely denounced by both Chinese officials and scientists, who initially labeled it deplorable.

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NASA admits mistake in banning Chinese student -- but likely too late to help