Reports claim that Fast and Furious 7 star Vin Diesel is allegedly very difficult to work with on the upcoming movie, but Universal Pictures Chairwoman Donna Langley publicly denies those allegations.

"This production is working through some challenges that are historically unprecedented. The crew and cast, led by Vin [Diesel], have been nothing but terrific under these circumstances," said Langley, according to an IB Times report.

According to The Hollywood Reporter, an unidentified source told the entertainment company that the 46-year-old native New Yorker has not been cooperative with the film's crew during the filming of the next installment in the Fast and Furious series.

"Vin spent a whole day in his trailer one day," said the nameless source to The Hollywood Reporter. "The next day, they waited four hours for him. He called a meeting (on May 28) of studio execs to his trailer for two-and-a-half hours to say, 'What the f*** am I doing here?"

Those reports contradict Diesel's personality and mood on social media, where the actor constantly post positive pictures and messages regarding the future film's progress on the set alongside his co-stars and crew. In addition, Diesel typically posts sad and inspirational messages honoring his fallen "brother" and longtime co-star Paul Walker, who was killed in a tragic car accident on November 30, 2013.

"Six months have passed... and I still go to the Fast Seven set every morning half expecting to see my brother...Count your blessings... the blessing of brotherhood...," posted Diesel on his official Facebook page on June 1.

The Fast and the Furious 7 film which has an all-star cast including the late Paul Walker, Vin Diesel, Jordana Brewster, Dwayne "The Rock" Johnson, Tyrese Gibson, Ludacris, Michelle Rodriguez, Kurt Russell and Romeo Santos will appear in movie theaters on April 10th 2015.