The first batch of dates for Katy Perry’s “Witness” tour have been postponed due to technical delays, the singer announced on Thursday.

“Due to unavoidable production delays, major elements of my tour stage design could not be available for me to rehearse on until this week,” the singer said in a post on Instagram.

“I’ll be spending the next few weeks taking the time to properly prepare the show to be an experience I am proud to share with you. I’m sorry for any inconvenience this causes, but hope everyone who sees the show will agree it was worth the wait.”

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Originally scheduled to begin on September 7 in Columbus, Ohio, the tour will now start September 19 in Montreal. Most shows were postponed to later dates, but a stop in Buffalo, NY was canceled. Her full tour schedule is available at her website.

Perry’s tour is expected to have an elaborate design, as has become her style. According to a story published by UPI, the tour has been promoted as “an imaginative trip from outer-space to inner-space, from the planets to the bottom of our oceans, and a musical journey through Katy Perry’s biggest milestones and mega-hits right up to her latest album.”

That album, “Witness,” debuted at No. 1 on the Billboard 200 chart in June. It sits at No. 101 on the album chart at this point.