there was an error opening this document. acrobat cannot open this file because a task is still active in acrobat.
please return to acrobat and end the task before opening this file.
Hope you're doing well.
Could you please check your task manager and kill any acrobat process if running and try again ?
If not resolved, please revert.
For more help please refer to: https://helpx.adobe.com/download-install/kb/close-conflicting-processes.html