Home → CLC FAQ - Basics: Installation, data, system resources → Starting up and running the Workbench → Why do I see a JVM error when I start up the Workbench?
4.4. Why do I see a JVM error when I start up the Workbench?
An error like the one below can be due to a number of causes.
The JVM could not be started. The maximum heap size (-Xmx) might be too large or an antivirus or firewall tool could block the execution.
The causes include:
1) You are working on a 64 bit system and have mistakenly downloaded the 32-bit version of the Workbench, whereas you used to be running the 64 bit version of the Workbench.
If this may have been what happened, please download the 64 bit installer and try installing again.
2) You are working on a 32 bit Windows XP system with more than 2Gb of RAM. Here, your memory settings may be too high.** To check this, please find the file in your CLC Workbench installation directory that ends in ".vmoptions". (If you cannot see such a file, please ensure you have set your folder options on Windwos to allow you to see hidden files.)
Please decrease your memory setting in the vmoptions file to 1000m, and restart your Workbench. That is, edit the line that starts with -Xmx such that it looks like this:
3) Anti-virus software may be interfering with start up. You can test this by briefly turning such software off and see if your CLC Workbench then starts up.
If you have checked all these possibilities and you continue to see the problem, please email firstname.lastname@example.org with a detailed explanation of what you are seeing. Including screenshots of the error can often be helpful to us in trying to troubleshoot the issue.