Thanks @LordOfTheRings. Now I know the reason. My profile is editor and I don't have permission to activate this, my admin activate for me.

What happens when you select the PDF> click More Info? Does that open a viewer for you to navigate through pages?If not, you can integrate Dynamic Media with AEM to get viewers functionality enabled. https://experienceleague.adobe.com/docs/experience-manager-65/assets/dynamic/administering-dynamic-media.html?lang=en https://experienceleague.adobe.com/docs/experience-manager-65/assets/dynamic/managing-viewer-presets.html?lang=en

@jlfera,Have you installed all your packages such as ui.apps, core, package-dependencies into your AEM environment? Does your bundle depend on any content structure to perform as expected? Your error code does not have sufficient detail, can you please provide us with more information from the logs? Can you please analyse your AEM instance using these basic steps to debug AEM, https://sourcedcode.com/blog/aem/development/basic-steps-to-debug-an-error-in-aem, and let us know what you find?

Policy needs to be updated for that particular Template:Steps:1. click on Page Information( Mid option on the top left corner of the same page)2. select Edit Template3. on the template editor page click on the container layout box and select the policy icon.4. From the left box's first drop down select one existing policy and save it.5. else you can create a new one by writing name in the second box and select the component category from the right pan.6. save and re-fresh the page hope this will...

Please Installed 32 bit version.https://download.macromedia.com/aem-assets-companion-app/aem-desktop-win32-2.0.3.2.exe or On Windows, the installer may prompt to install Visual Studio C++ Redistributable 2015 . Follow on-screen instructions to install it. If the installation fails then install it manually. Download the installer from here and install both vc_redist.x64.exe and vc_redist.x86.exe files. Re-run the AEM desktop app installer.