I'm confused by your question. In the title of the post, you say "I'm using Indesing [sic] on my PC..."
In the message, you say "I'm using Adobe Acrobat DC on my PC..."
What application are you using? What computer platform?
Presuming you are really using ID, this would be normal if you upgraded to a new version of ID and are opening files created in a previous version. Once saved in the new version it won't happen again until the next time you upgrade.
I am using InDesign in my PC.
Thanks. It worked.