Elon Musk has admitted that Tesla (TSLA) made an “idiotic” mistake when it came to the production of the Model X SUV.

The admission from Musk came on Wednesday in the form of a tweet to one of his 73.3 million fans on Twitter. The CEO claimed in the post that Tesla “dropped the ball badly” when it came to the production ramp-up of the new Model X, especially as demand was still so high for the EV.

Tesla stopped production of the old Model X in December 2020, Musk said in his tweet.

The post from Musk was in response to a user who tweeted the billionaire that some customers have been waiting a year or more for their Model X cars and keep receiving delays without communication from the automaker.

Musk explained the delays in another tweet, writing, “Model X is an extremely difficult car to build. Most complex passenger car ever.”

According to Tesla’s website, the Model X has Falcon Wing doors, enhanced aerodynamics features, a 5,000-pound towing capacity, 348-mile range on a single charge, Full Self-Driving capability, 1,020 horsepower and a top speed of 163 mph.

The updated version of the Model X started hitting customers in October 2021 after seeing months of delays, which Tesla said were caused by supply-chain issues, Business Insider reported.

Tesla first unveiled the Model X in 2015.

As of Thursday at 9:32 a.m. ET, shares of Tesla were trading at $916.25, down $15.75, or 1.69%.

Tesla CEO Elon Musk will personally drop by at the "Giga Fest"
Tesla CEO Elon Musk. AFP / Odd ANDERSEN