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This error most likely means an IntelliJ plugin and the IDE’s bundled UI libraries are incompatible—not that Gemini rejected a request or your Markdown is malformed. The closest matching JetBrains reports identify Junie, not a Google Gemini plugin, so first confirm the plugin’s name and vendor before applying a Junie-specific workaround.
What the error means
The relevant exception may look like this:
java.lang.NoSuchMethodError: ...BridgeProvideMarkdownStylingKt.ProvideMarkdownStyling(... MarkdownProcessor ...)A NoSuchMethodError is a JVM linkage error: code was compiled expecting a particular method signature, but the class loaded at runtime does not contain that method. Here, the missing signature is in JetBrains’ Jewel/Compose Markdown UI bridge. That makes an incompatibility between the plugin and IDE platform libraries the leading explanation.
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It is different from a Markdown syntax problem, an API-key error, or an AI service outage. Those issues may prevent requests or responses, but they do not ordinarily cause the JVM to report that a UI method is missing.
For comparison, ClassNotFoundException means a requested class could not be located, while NoClassDefFoundError means a class expected at runtime was unavailable. All are Java linkage/loading problems, but they point to different missing items.
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First identify which plugin is failing
The title may say “Gemini,” but the closest matching public reports are for JetBrains Junie. One reports the exception with IntelliJ IDEA Ultimate build IU-251.27812.12 and Junie 251.204.122; another describes an empty Junie window in IntelliJ IDEA 2025.1.4. These are reported reproductions, not proof that every Gemini-branded plugin—or every installation of those versions—is affected.
In the IDE, open Settings/Preferences | Plugins | Installed and note the exact plugin name, vendor, and version. Also record:
- IDE product (IntelliJ IDEA, WebStorm, PyCharm, or another JetBrains IDE), edition where applicable, and full build number.
- Operating system and whether the IDE is on a stable or EAP build.
- The failing tool window’s name and the complete exception from the IDE log.
Junie, JetBrains AI Assistant, Google Gemini integrations, and third-party Marketplace plugins are distinct products. Do not assume a fix or issue report for one applies to another.
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Try the low-risk fixes first
- Update the IDE. Use Help | Check for Updates, install an available update, and restart. Menu labels can vary slightly by product or operating system.
- Update the affected plugin. Go to Settings/Preferences | Plugins | Installed, find the plugin named in your stack trace, install an offered update, and restart.
- Check relevant plugin updates. If the error began after installing or updating another plugin, update or temporarily disable that plugin too. Focus on components plausibly involved in the AI tool window or UI; avoid installing unrelated plugins as a diagnostic guess.
- Test with the suspected plugin disabled. Disable it from the Installed list and restart. If the exception stops, that implicates the plugin or its interaction with the current IDE. Re-enable it only to test a compatible version.
Updating both IDE and plugin is the quickest common remedy, but it is not guaranteed: the Marketplace may not offer a compatible build immediately, or the installed IDE line may not be supported. JetBrains has documented platform/plugin update-detection problems and has warned that Kotlin-based UI APIs may not remain binary-compatible across major platform versions (update-detection issue; compatibility guidance).
Cleanly reinstall the affected plugin
If updating does not help, try the normal uninstall/reinstall before manually touching files:
- In Settings/Preferences | Plugins | Installed, uninstall the affected plugin.
- Restart the IDE so its plugin state is unloaded.
- Install the plugin again from the official JetBrains Marketplace, if that is the plugin’s official distribution channel.
- Restart again and test the tool window.
If the same exception remains, the issue may be an incompatible IDE/plugin pairing rather than a damaged installation. A stale JAR or incomplete update is another possibility, but should not be assumed.
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Test with a clean IDE profile
Use a fresh configuration/profile or a separate clean IDE instance, then install only the affected plugin and test. If it works there but not in the original profile, the original plugin state, configuration, or an interaction with another installed plugin is more likely than an account or service problem. A fresh profile is a useful diagnostic; it is not necessary to erase your normal settings.
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Check for plugin conflicts
If the problem started after adding another plugin, disable that recent addition, restart, and test again. If necessary, disable third-party plugins and re-enable them one at a time, restarting and testing between changes. This can reveal a conflict without deleting your entire configuration.
Check stable versus EAP compatibility
An EAP IDE can contain platform changes that a plugin has not yet accommodated. If you deliberately use an EAP build, check whether the plugin explicitly supports that build. For a work-critical plugin, a stable IDE/plugin pairing may be more practical. Likewise, support in IntelliJ IDEA does not establish support in WebStorm or PyCharm: check compatibility for the specific product and build.
Consider a temporary IDE rollback only if needed
If the failure began immediately after an IDE upgrade and no compatible plugin update is available, temporarily returning to the previous IDE version may restore a working pairing. Treat this as a workaround, not a universal fix: an older IDE may lack security updates, features, or support for newer project requirements. Keep a record of the current build and follow the IDE vendor’s supported installation/rollback process.
When manual plugin-folder cleanup is justified
Only consider manual removal if normal uninstall/reinstall leaves the same failure, the IDE appears to retain an old plugin version, an update may have been incomplete, or there are signs of duplicate plugin files.
- Exit every JetBrains IDE process.
- Back up settings if they are stored in the location you plan to change.
- Locate and remove only the affected plugin’s directory, if you can identify it reliably.
- Start the IDE and reinstall the plugin from its official source.
Do not delete the entire IDE configuration directory as a first response; it can contain settings, keymaps, and other plugin state. A historical Atlassian/JetBrains troubleshooting document describes stale plugin binaries causing NoSuchMethodError after an incomplete update, but that example does not establish that stale files caused the current Junie reports.
Collect the right log information
Open Help | Show Log in Explorer/Finder (or use the closest equivalent in your IDE’s Help menu) and find the current IDE log. Include the complete exception and stack trace, not only the first line. When filing a report with the plugin vendor or JetBrains, provide:
- IDE product, edition if applicable, full build number, and stable/EAP status.
- Operating system and the plugin’s exact name, vendor, and version.
- When the issue began and whether an IDE or plugin update preceded it.
- Steps that reproduce it and whether a fresh profile changes the result.
- The complete stack trace, especially the
BridgeProvideMarkdownStylingKt.ProvideMarkdownStylingandMarkdownProcessorlines.
If your plugin is Junie and the exception matches, include the links to JUNIE-450 and, for the empty panel on IDEA 2025.1.4, IDEA-376299. If the plugin is actually a Gemini integration, report it to that plugin’s vendor instead; these Junie reports do not establish its cause.
Quick Recap
How to tell whether it is fixed
- The affected AI tool window opens and is not blank, black, or stuck loading.
- The IDE log no longer records the missing
ProvideMarkdownStylingmethod. - A simple prompt can be sent and a response is displayed.
- Markdown-formatted content renders normally.
- Other IDE functions continue to work.
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