How to Fix the Expected an Array Error When Comparing PDF Files
Question details
The user needs to resolve an 'expected an array' error that occurs when attempting to compare two PDF files.
- Product
- Adobe Acrobat
- Device & OS
- not provided
- Scenario
- Using the Compare Files feature to analyze differences between two PDF documents.
- Observed behavior
- The software displays an 'expected an array' error message and fails to complete the document comparison, even if the documents have the same number of pages.
Before proceeding, verify that you are running the latest version of your PDF software, as updates frequently include bug fixes for document processing and structural parsing errors.
Recreate the Problematic PDF Files Using Save As
Saving the PDF files as new documents can restructure the internal code and resolve underlying corruption triggering the array error.
The 'expected an array' error typically points to a damaged or unusually structured PDF. Using the 'Save As' command forces the application to rewrite the document's internal elements, which can fix broken formatting tags or corrupt structures.
Launch your PDF editor and open the first PDF document you intend to compare.
Click on 'File' in the top menu bar, select 'Save As', and choose a location on your computer.
Assign a new filename to the document to ensure you do not overwrite the original file, then click 'Save'.
Repeat the 'Save As' process for the second PDF file, and then try running the Compare Files tool again with the two newly created PDFs.
Test with Different PDF Documents
Running a comparison test on different files helps isolate whether the issue is document-specific or an application-wide bug.
Manage and Edit PDF Files Seamlessly with WPS Office
Avoid complex structural errors and file corruption by using WPS Office for your PDF tasks. WPS Office includes a robust PDF editor that allows you to read, modify, annotate, and convert PDF documents efficiently and error-free.
- 1. Install WPS Office: Download and install the free version of WPS Office on your computer or mobile device.
- 2. Open your PDF: Launch WPS Office and drag and drop your PDF file into the workspace, or use the 'Open' menu.
- 3. Utilize PDF tools: Navigate to the 'PDF' tab to access a comprehensive suite of tools for editing text, highlighting, or leaving comments.
- 4. Save or convert safely: Save your changes securely or convert the PDF to another format without risking document corruption.
Frequently Asked Questions
What does the 'expected an array object' error mean?
This error occurs when the PDF software encounters missing, improperly formatted, or malformed data in the document's internal code. Since PDFs are built using specific structures like arrays and dictionaries, encountering invalid data triggers this specific structural error.
Why does the Compare feature fail even if the page numbers match?
The 'Compare Files' tool analyzes deeper elements like text, images, and internal tags rather than just the page count. If the document's underlying data structure is damaged or contains corrupted fonts, the tool will fail to parse it regardless of how many pages the document has.
Can I fix a corrupted PDF file without recreating it?
Sometimes minor corruptions can be fixed automatically by the software when you use the 'Save As' command or run the file through a PDF optimization/repair tool. However, if the file is severely damaged, regenerating it from the original source document is the most reliable solution.
How do I regenerate a PDF from a source file?
Open the original document in its native application (such as Microsoft Word, Excel, or PowerPoint). Go to 'File', select 'Export' or 'Save As', and choose the PDF format to generate a completely new, error-free PDF file.
