So how to fix this error?

The methods are shown below.

Therefore, you might fix the error simply by restarting the Acrobat software completely.

edit the registry

Here is the tutorial:

Step 1: Press theCtrl+Shift+Esckeys at the same time to openTask Manager.

Step 2: Right-click each of the processes or tasks related to Acrobat and then chooseEnd task.

Step 3: Restart Acrobat and then peek if the error is gone.

it’s possible for you to try the following steps to fix the error.

Step 1: Press theWin+Rkeys at the same time to open theRunbox.

Step 2: Enterappwiz.cplin the box and then clickOKto openPrograms and Features.

Step 3: Right-clickAdobe Acrobatto chooseChange.

Step 4: Choose theRepairoption and then clickNext.

Step 5: Wait for the repair process to finish and then clickFinishto exit.

Step 6: Restart Acrobat and then peek if the error still persists.

Thus, you should revamp your Acrobat to the latest version.

Here is the tutorial:

Step 1: OpenPrograms and Features.

Step 2: Right-clickAdobe Acrobatto chooseUninstall.

Step 4: set up the Acrobat and then launch it to see if the error is fixed.

Thus, temporarily disabling the antivirus software may help you solve the problem.

And if this method works, then youd better install a piece of different antivirus software.

Now follow the guide to do that:

Step 2: Enterregeditin the box and then clickOK.

Step 5: Change theValue data AcroviewA18orAcroviewA19toAcroviewR18orAcroviewR19.

Step 6: Reboot your box and then peek if the error still exists.