Null Reference Exception

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a subscribe button on a green screen
an optical illusion of a rainbow colored sphere on a black background
a screenshot of a cambridge university press website
a man is working on a circuit board with a soldering iron
    a drawing of a circle with a letter v in the middle
    a screen shot of a video game that says superior shadow plate on it
    a screenshot of a clash of clans game shows a collection of emotes
    a yellow circle with a white check mark in it
    an advertisement for e nest website development shows a person using a laptop
    a graph showing the sensitivity of different models including vgg-16 resnet covid-net proposed and covid-19
    a poster for best website designing services in delhi
    two soccer players on a field with the words " subbuteo match days " on it
    a screenshot of a app called vent that is free
    the doctors hospital inc. post graduate interns batch 2021
    a screenshot of a video game that says complete customization at the bottom
    a notice on storage space issue of pre-download event is shown
    a blue number one logo on a black background
    a group of people are standing on a maze of colored roads
    a bunch of numbers are arranged in a circle with the number 1 in the middle
    a blue circle with the letter lb inside of it .
    a subscribe button with a hand pressing it and a bell .
    a drawing of sans with garticphone.com in the corner
    a poster that says community show share with a picture of a car in the background
    a screenshot of a defense victory game
    a cartoon character with green hair and a yellow hat is holding a microphone .
    a cartoon boy is holding a flashlight in his hand in a dark room .
    a collage of pictures of henry viii with a quote by henry viii
    a screenshot of a reddit post about ice is just frozen worter
    a surgical online 8 hegar medical dilator sounds set 7.5inch double ended instrument ( double ended )
    a scatter plot of a number of numbers on a white background with a few red dots .
    a thank you message from the captain of clutch is displayed
    a tweet from elon musk asking for some from him

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      a screenshot of a test report on a cell phone shows that the test was completed .
      a white background with the words " il est interdit de braquer une personne avec le pettoire (ppa ) "
      a collage of images including a website redesign button
      a screenshot of a person 's profile on a phone with a picture of a person in a circle .
      a close up of a person 's signature on a piece of paper .
      a sign that says " welcome babe " with purple moons and crystals around it
      a screenshot of a person 's profile with the name jakke # 5862
      a page that says valimail will rank your accounts to identify security gaps and selling opportunities on the top
      getting no message is also a message . lessons taught by life
      a screenshot of a conversation between big brain tmth and maidana pessi
      a red subscribe now button is on a white background
      a banner that says i up breaking update we ve made a difference in someones life today
      a man stands in front of a sign that says aresti on it
      a hand is pointing at a subscribe button on a green background
      a blurry picture of a boxing ring with the words kselebox in the corner
      a green background with the words 50,000 blocks until initial emission reduction written on it
      a whiteboard with the words daily control written on it