Error 80040438 - Multiple QuickBooks Running

Modified on Thu, 20 Aug at 8:51 PM

Overview

In the QQube Configuration Tool, the synchronization log list may display a red entry similar to Error: 80040438 - CLICK TO FIX. Select that red status link to open this guide.

Resolve every failed entry

A later synchronization that reports Success does not mean this earlier error corrected itself. The failed entry must still be reviewed and resolved.

The detailed synchronization log for this entry contains a message similar to the following:

Detailed synchronization log message

<<<<<<<<<<<<<<<<<<<<<< 10/15/2027 06:44:57 PM >>>>>>>>>>>>>>>>>>>>>>
BeginSession
Error Code: 80040438
The application trying to connect to QuickBooks is not supported while multiple instances of QuickBooks are running.
<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<

What the Error Means

Error 80040438 comes directly from the Intuit Software Development Kit. QQube cannot communicate with QuickBooks while multiple instances of QBW32.EXE are running under the Windows user where the synchronization occurs.

QuickBooks may allow more than one company-file window to be opened manually, but the Intuit SDK cannot operate while multiple QuickBooks instances are running in the synchronization session.

Where the Problem Occurs

Environment	Windows User to Check
Single-User workstation	The Windows user currently running QQube and QuickBooks.
Multi-User server	The dedicated Windows synchronization user where QQube was installed.

Resolution

Complete these steps under the Windows user where QQube synchronization runs.

1. Close All QuickBooks Instances

Close every open QuickBooks window in the synchronization session.

2. Check Windows Task Manager

Open Windows Task Manager and confirm that only one instance of QBW32.EXE remains.

If more than one instance is running, close the extra QuickBooks process before starting the synchronization again.

3. Synchronize Again

Start the QQube synchronization again after only one QuickBooks instance remains in the synchronization session.

Expected Result

Only one QuickBooks instance is running under the QQube synchronization Windows user, and the synchronization completes without Error 80040438.