Would you provide more information about the problem so that we can help you?
What is the name of the app? Is it a desktop app on a Windows/Mac computer or a mobile app on an iPad/iPhone or Android tablet/phone?
What is the version of the app?
What is the operating system on the computer/device?
Do you see an error message? What does it say?
Hello I have Adobe creative cloud, I am trying to open up my son lessons for his English class work and it's not letting me it keeps saying that I need to get the adobe flash reader I have that also. His school work is through K-12
You posted your question to the Reader/Acrobat DC for mobile forum, which is not related to Creative Cloud.
I will move this thread to the Creative Cloud forum. To get answers, you still need to provide more details about your system and the error message that you see, etc.
I'm not seeing any error signs