Download, Fix, and Update Gui.py.json

Last Updated: 11/24/2023
[Time to Read: ~3-5 minutes]

gui.py.json is considered a type of JavaScript Object Notation file. It is most-commonly used in Calibre 4.2.0 developed by Kovid Goyal. It uses the JSON file extension and is considered a Internet Web (JavaScript Object Notation) file.

The initial introduction of gui.py.json released in Calibre 4.2.0 was for Windows 10 on 10/18/2019. According to our records, this release is the only version of this file offered by Kovid Goyal.

Please see below for more detailed information, JSON file troubleshooting instructions, and free downloads of different versions of gui.py.json.

File Analysis Provided by Jason Geater (Author)

File Overview

General Information ^✻
File Name:	gui.py.json
File Extension:	JSON file extension
File Type:	Internet Web
Description:	JavaScript Object Notation
User Popularity Rating:

Developer and Software Information
Software Program:	Calibre 4.2.0
Developer:	Kovid Goyal
Software:	Calibre
Software Version:	4.2.0

File Details
File Size (Bytes):	2025
Oldest File Date:	12/28/2019
Latest File Date:	12/28/2019

View Other gui.py.json Information

File Info	Description
File Size:	2025 bytes
File Modification Date/Time:	2019:12:28 18:17:07+00:00

^✻ Portions of file data provided by Exiftool (Phil Harvey) distributed under the Perl Artistic License.

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What are gui.py.json Error Messages?

General gui.py.json Runtime Errors

gui.py.json file errors often occur during the startup phase of Calibre, but can also occur while the program is running. These types JSON errors are also known as “runtime errors” because they occur while Calibre is running. Here are some of the most common gui.py.json runtime errors:

gui.py.json could not be found.
gui.py.json error.
gui.py.json failed to load.
Error loading gui.py.json.
Failed to register gui.py.json / Cannot register gui.py.json.
Runtime Error - gui.py.json.
The file gui.py.json is missing or corrupt.

Microsoft Visual C++ Runtime Library

Runtime Error!

Program: C:\Users\Tester\AppData\Roaming\calibre\gui.py.json

This application has requested the Runtime to terminate it in an unusual way.
Please contact the application's support team for more information.

Most JSON errors are due to missing or corrupt files. Your gui.py.json file could be missing due to accidental deletion, uninstalled as a shared file of another program (shared with Calibre), or deleted by a malware infection. Furthermore, gui.py.json file corruption could be caused from a power outage when loading Calibre, system crash while loading or saving gui.py.json, bad sectors on your storage media (usually your primary hard drive), or malware infection. Thus, it’s critical to make sure your anti-virus is kept up-to-date and scanning regularly.

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How to Fix gui.py.json Errors in 3 Steps (Time to complete: ~5-15 minutes)

If you're encountering one of the error messages above, follow these troubleshooting steps to resolve your gui.py.json issue. These troubleshooting steps are listed in the recommended order of execution.

Step 1: Restore your PC back to the latest restore point, "snapshot", or backup image before error occurred.

To begin System Restore (Windows XP, Vista, 7, 8, and 10):

Hit the Windows Start button
When you see the search box, type "System Restore" and press "ENTER".
In the search results, find and click System Restore.
Please enter the administrator password (if applicable / prompted).
Follow the steps in the System Restore Wizard to choose a relevant restore point.
Restore your computer to that backup image.

If the Step 1 fails to resolve the gui.py.json error, please proceed to the Step 2 below.

Step 2: If recently installed Calibre (or related software), uninstall then try reinstalling Calibre software.

You can uninstall Calibre software by following these instructions (Windows XP, Vista, 7, 8, and 10):

Hit the Windows Start button
In the search box, type "Uninstall" and press "ENTER".
In the search results, find and click "Add or Remove Programs"
Find the entry for Calibre 4.2.0 and click "Uninstall"
Follow the prompts for uninstallation.

After the software has been fully uninstalled, restart your PC and reinstall Calibre software.

If this Step 2 fails as well, please proceed to the Step 3 below.

Calibre 4.2.0

Kovid Goyal

Step 3: Perform a Windows Update.

When the first two steps haven't solved your issue, it might be a good idea to run Windows Update. Many gui.py.json error messages that are encountered can be contributed to an outdated Windows Operating System. To run Windows Update, please follow these easy steps:

Hit the Windows Start button
In the search box, type "Update" and press "ENTER".
In the Windows Update dialog box, click "Check for Updates" (or similar button depending on your Windows version)
If updates are available for download, click "Install Updates".
After the update is completed, restart your PC.

If Windows Update failed to resolve the gui.py.json error message, please proceed to next step. Please note that this final step is recommended for advanced PC users only.

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If Those Steps Fail: Download and Replace Your gui.py.json File (Caution: Advanced)

If none of the previous three troubleshooting steps have resolved your issue, you can try a more aggressive approach (Note: Not recommended for amateur PC users) by downloading and replacing your appropriate gui.py.json file version. We maintain a comprehensive database of 100% malware-free gui.py.json files for every applicable version of Calibre. Please follow the steps below to download and properly replace you file:

Locate your Windows operating system version in the list of below "Download gui.py.json Files".
Click the appropriate "Download Now" button and download your Windows file version.
Copy this file to the appropriate Calibre folder location:

Windows 10: C:\Users\Tester\AppData\Roaming\calibre\
Restart your computer.

If this final step has failed and you're still encountering the error, you're only remaining option is to do a clean installation of Windows 10.

GEEK TIP : We must emphasize that reinstalling Windows will be a very time-consuming and advanced task to resolve gui.py.json problems. To avoid data loss, you must be sure that you have backed-up all of your important documents, pictures, software installers, and other personal data before beginning the process. If you are not currently backing up your data, you need to do so immediately.

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Download gui.py.json Files (Malware-Tested 100% Clean)

CAUTION : We strongly advise against downloading and copying gui.py.json to your appropriate Windows system directory. Kovid Goyal typically does not release Calibre JSON files for download because they are bundled together inside of a software installer. The installer's task is to ensure that all correct verifications have been made before installing and placing gui.py.json and all other JSON files for Calibre. An incorrectly installed JSON file may create system instability and could cause your program or operating system to stop functioning altogether. Proceed with caution.

Calibre 4.2.0

File Name

Software Version

File Version

Architecture

gui.py.json

64-bit (x64)

Expand for Detailed File Information +

OS Version:	Windows 10
File Size:	2025
File Date:	12/28/2019
MD5 Checksum:	90bf922719c5efb07af792b682b4d92d
SHA1 Checksum:	e7d2deddb82d4c474b60e509b78ef06304537902
SHA256 Checksum:	c1043244524b2ad3232270557ea1ce564347df19743dde7c7e876e2ee2d83c56
CRC32:
File Directory Location:	C:\Users\Tester\AppData\Roaming\calibre\

File Version, System, and Machine Information
File Modification Date/Time:	12/28/2019

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Files Related to gui.py.json

JSON Files Related to gui.py.json

File Name	Description	Software Program (Version)	File Size (bytes)	File Location
ECSConfig.json	JavaScript Object Notation	Calibre 4.2.0	328	C:\Users\Tester\AppData\Local\
html.json	JavaScript Object Notation	Calibre 4.2.0	9983	C:\Windows\Prefetch\
FlightedFeatures.json	JavaScript Object Notation	Calibre 4.2.0	659	C:\Program Files\Microsoft Office 15\root\vfs\P...
css.json	JavaScript Object Notation	Calibre 4.2.0	26269	C:\Windows\Prefetch\
PreSignInSettingsConfi...	JavaScript Object Notation	Calibre 4.2.0	22013	C:\Users\Tester\AppData\Local\

Other Files Related to gui.py.json

File Name	Description	Software Program (Version)	File Size (bytes)	File Location
setupact.log	Log	Calibre 4.2.0	14252	C:\Windows\System32\Sysprep\Panther\
api-ms-win-core-profil...	ApiSet Stub DLL	Microsoft® Windows® Operating System (10.0.17763.132)	19072	C:\Program Files (x86)\Calibre2\app\bin\
api-ms-win-core-sysinf...	ApiSet Stub DLL	Microsoft® Windows® Operating System (10.0.17134.12)	12136	C:\Users\Tester\AppData\Local\Microsoft\OneDriv...
diagwrn.xml	Extensible Markup Language	Calibre 4.2.0	5718	C:\Windows\System32\Sysprep\Panther\
api-ms-win-core-rtlsup...	ApiSet Stub DLL	Microsoft® Windows® Operating System (10.0.17134.12)	10600	C:\Users\Tester\AppData\Local\Microsoft\OneDriv...

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