The affected user gets the error when he tries to launch the Unifi controller software. In some cases, the affected user encountered the error when he upgraded Unifi controller software. Some of the affected got the error message after the application is launched for 5 minutes or more. This error is reported by Windows, Linux, Mac, and Raspberry Pi users. Before proceeding with the troubleshooting process, make sure your network type is either Private or Domain.
Solution 1: Close the Unifi-Related Processes Through the Task Manager
The issue you are encountering could be caused by a temporary software/communication glitch. In this case, killing all the Unifi related processes and relaunching the software may solve the problem. For illustration, we will discuss the process for a Windows PC.
Solution 2: Empty Space on the System Drive
The Unifi controller software requires some additional free space on the system drive to complete its operation. You may encounter the error at hand if you do not have enough free space available on the system drive. In this context, creating some free space on your system drive may solve the problem. For illustration, we will discuss the process for Windows.
Solution 3: Change the Specified Engine in System Properties File
If the database was created by the ‘mmapv1’ storage engine but the specified storage engine was ‘wiredTiger’, then you may encounter the error at hand. In this context, forcing the controller application to use the mmapv1 storage engine may solve the problem. For illustration, we will discuss the process for a Windows PC.
Solution 4: Use A User Profile Without Special Characters
Unifi controller is known to have issues when the path to the Ubiquiti Unifi folder has special characters in it because the user profile has special characters in its name (e.g. C:\Users\ÄçìÞôñçò\Ubiquiti UniFi) and thus cause the error under discussion. In this scenario, creating a new user profile without special characters may solve the problem. Keep in mind that you can change the current user name but that will not reflect in the path to the Ubiquiti Unifi folder, so, you have to create a new user account and transfer all the data to that user.
Solution 5: Clear the Default Port Required by Unifi Controller Software
The Unifi Controller application requires port 8080 (by default) to operate normally. You may encounter the error at hand if the said port is used by another program. In this case, stopping the program using the said port or configuring the problematic program (or the Unifi Controller application) to use another port may solve the problem. For illustration, we will discuss the process for a Windows PC.
Solution 6: Rename the Unifi Logs
The Unifi controller creates logs (like many other applications) to make the troubleshooting process easy. You may encounter the error at hand if the said logs have corrupted. In this case, renaming these log files (newer log files will be created on the next launch) may solve the issue. For illustration, we will discuss the process for Windows.
Solution 7: Delete the Journal Files in Unifi Folder
The Unifi controller software uses journal files to store different types of data. You may encounter the error under discussion if these journal files are corrupt. In this context, deleting these journal files may solve the problem. For elucidation, we will discuss the process for a Windows PC.
Solution 8: Install the Unifi Controller Software as A Service
The Unifi Controller software may run into different types of issues if it is not installed as a service. The same could be the reason for the current error as well. In this context, installing the controller software as a service may solve the problem.
Solution 9: Update Java to the Latest Build
Java is essential for the operation of Unifi controller software. Java is regularly updated to cater to new technological developments and patch the known bugs. You may encounter the error at hand if you are using an outdated version of Java. In this context, updating Java to the latest build may solve the problem. For elucidation, we will discuss the process for a Windows PC.
Solution 10: Reinstall Java
If updating Java has not solved the issue, then the problem is caused by either the corrupt installation of the Java or incompatible version of Java. In this scenario, uninstalling and reinstalling Java may solve the problem. For illustration, we will discuss the process for Windows.
Solution 11: Reinstall the Unifi Network Controller Software
If reinstalling Java has not solved the issue, then the issue is caused by a corrupt or outdated installation of the Unifi controller software. In this scenario, uninstalling and reinstalling the controller software may solve the problem. For elucidation, we will discuss the process for a Windows PC.
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