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This article will show you how to Fix Failed to Launch Lunar Client Error on Windows. When you try to open the Minecraft Lunar Client, do you get the message “Failed to launch Lunar Client: Java launch failed”? Most of the time, this problem is caused by Lunar Client settings that don’t give it enough RAM or by a lost or broken Java Runtime Environment (JRE). The Lunar Client is a popular third-party client for Minecraft players who want to improve their game experience.
It gives modders an easy-to-use interface, improves framerates where possible, and works with different running systems. Lunar Client is a simple way to improve your Minecraft experience. It is easy to set up and works better than before. Other possible causes include a lot of cache folders or an antivirus tool that stops the client from working. This article talks about different ways to fix Fix Failed to Launch Lunar Client error.
Ways to Fix ‘Failed to Launch Lunar Client’ Error on Windows
Run Lunar Client as an Administrator
You might get the mistake being talked about if Lunar Client can’t get to some system files. Run the client as an administrator to make sure that the limited access is not the problem. By doing this, Lunar Client will be able to use files or resources that it wouldn’t be able to use otherwise. To start Lunar Client as an administrator, do the following:
- Navigate to the folder where Lunar Client is installed.
- Find the executable file that you use to launch the client.
- Right-click on Lunar Client’s EXE file and select Run as administrator from the context menu.
If the trouble goes away when Lunar Client is run as an administrator, this means that restrictions in the operating system are to blame. So, you should set up the program so that it always runs as an administrator.
Delete the Old Renderer Log File
The error message also says that the Java start did not work and that a report could not be sent. Lunar Client might not send the error report because of a problem with the old renderer log file. This file has information about mistakes that have been reported before and game settings.
Some Reddit users say that the problem being talked about can be fixed by deleting this file. So, if none of the fixes worked, you should remove the renderer.old file from the Logs folder. To do that, follow these steps:
- Launch Lunar Client.
- Go to the About menu from the top.
- Click on Logs under Folders. Clicking this will take you to the Logs folder.
- Right-click on the Renderer.old file and click on the Delete icon.
Apply Some Preliminary Checks
- Relaunch Lunar Client after closing it.
- Close other apps running in parallel with Lunar Client so they won’t interfere with it.
- Ensure that your device is connected to the internet and the network connection is stable.
- If the above checks do not solve the problem, apply the remaining fixes.
Change the Allocated Memory in Lunar Client’s Settings
Users can decide how much memory the client should have access to with Lunar Client. It helps people get the most out of their system resources and puts less stress on their hardware.
Even though it’s great to have so much freedom, don’t be cheap when assigning memory. If you set the client up with too little memory, which isn’t enough to meet the client’s needs, you’ll probably get the error we’re talking about. Follow these steps to change the amount of memory Lunar Client uses:
- Launch Lunar Client.
- Click on the Settings menu at the top.
- To change the memory allocation, drag the slider under Allocated Memory.
Reinstall Java Runtime Environment
To work right, Lunar Client needs Java Runtime Environment. You could get Java-related errors like the one in this piece if it wasn’t installed correctly, some of its files were damaged, or one of its files was lost. You should restart it to make sure that’s not the case. You don’t need to uninstall the older version before reinstalling the newer one because the newer version will instantly update and fix any files that are missing or broken. To set it up, do these things:
- Go to the Java website.
- Click on Download Java.
- Click on Download Java once more on the next page.
- Run the file once it has been downloaded and click Yes in the UAC window.
- Then click on the Install button.
Delete Lunar Client’s Cache Folders
Like most game launchers, Lunar Client stores some game data in its cache files. This makes it easier for the client to get the information it needs from these places faster, which improves the client’s performance.
But sometimes the piled-up cache gets in the way of how the client works, causing problems that were not planned. You should clear out all cache folders to make sure that cache isn’t causing the error in question. To do that, follow these steps:
- Navigate to the following location:
C:\Users\\AppData\Roaming
- Find the lunarclient folder and open it.
- Here, you have to delete three folders: Cache, Code Cache, and GPUCache.
- Select the folders, right-click on them, and hit Delete.
Why Does Lunar Client Keep Crashing?
Lunar Client is a free game launcher for Minecraft that is made by a third party. Compared to Minecraft’s official game launcher, Lunar Client can download and start the game faster, improve the game’s frame rate (fps), and install some MODs faster. With Minecraft’s official game launcher, users have to directly install MODs, but Lunar Client doesn’t have this requirement. Because of this, a lot of people will want to use this game app. But some people say that when they try to start the game, the Lunar Client crashes on them.