Unable to start Rider after Update to 2026.1

Problem

Rider fails to start after updating to version 2026.1, displaying an error related to configuration.

Archived non-system classes are disabled because the java.system.class.loader property is specified (value = "com.intellij.util.lang.PathClassLoader"). To use archived non-system classes, this property must not be set
Error occurred during initialization of VM
java.lang.Error: A command line option has attempted to allow or enable the Security Manager. Enabling a Security Manager is not supported.

Cause

The JVM options for the IDE contain the -Djava.security.manager=com.intellij.platform.core.nio.fs.CoreBootstrapSecurityManager flag. This flag was used in older versions of Rider but has been removed in version 2026.1

Resolution

To resolve the issue, remove the outdated -Djava.security.manager=com.intellij.platform.core.nio.fs.CoreBootstrapSecurityManager flag from your JVM options. Follow these steps:

1. If Rider was installed using the Toolbox app:

   • Open the settings, go to "Edit JVM options," and remove the obsolete flag.

   

2. If Rider is not managed by the Toolbox app:

   • Locate and edit the .vmoptions file directly. Refer to the Advanced configuration → JVM options documentation for detailed steps.