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java.lang.NullPointerException: 	at org.eclipse.cdt.utils.envvar.EnvVarOperationProcessor.convertToList(EnvVarOperationProcessor.java:158)	at org.eclipse.cdt.managedbuilder.internal.envvar.EnvironmentVariableProvider$DefaultBuildPathResolver.resolveBuildPaths(EnvironmentVariableProvider.java:72)	at org.eclipse.cdt.managedbuilder.internal.envvar.EnvironmentVariableProvider.getBuildPaths(EnvironmentVariableProvider.java:219)	at org.eclipse.cdt.managedbuilder.internal.dataprovider.BuildEntryStorage.getEnvEntries(BuildEntryStorage.java:374)	at org.eclipse.cdt.managedbuilder.internal.dataprovider.BuildEntryStorage.putEntriesToLevel(BuildEntryStorage.java:186)	at org.eclipse.cdt.core.settings.model.util.AbstractEntryStorage.initCache(AbstractEntryStorage.java:71)	at org.eclipse.cdt.core.settings.model.util.AbstractEntryStorage.getEntries(AbstractEntryStorage.java:34)	at org.eclipse.cdt.managedbuilder.internal.dataprovider.BuildLanguageData.getEntries(BuildLanguageData.java:161)	at org.eclipse.cdt.core.settings.model.extension.impl.CDefaultLanguageData.getEntriesToCopy(CDefaultLanguageData.java:101)	at org.eclipse.cdt.core.settings.model.extension.impl.CDefaultLanguageData.createStore(CDefaultLanguageData.java:92)	at org.eclipse.cdt.core.settings.model.extension.impl.CDefaultLanguageData.copySettingsFrom(CDefaultLanguageData.java:85)	at org.eclipse.cdt.internal.core.settings.model.CLanguageSettingCache.copySettingsFrom(CLanguageSettingCache.java:47)	at org.eclipse.cdt.internal.core.settings.model.CLanguageSettingCache.(CLanguageSettingCache.java:36)	at org.eclipse.cdt.internal.core.settings.model.CFolderDescriptionCache.copyLanguageData(CFolderDescriptionCache.java:79)	at org.eclipse.cdt.core.settings.model.extension.impl.CDefaultFolderData.copyDataFrom(CDefaultFolderData.java:56)	at org.eclipse.cdt.internal.core.settings.model.CFolderDescriptionCache.(CFolderDescriptionCache.java:38)	at org.eclipse.cdt.internal.core.settings.model.CConfigurationDescriptionCache.copyFolderData(CConfigurationDescriptionCache.java:235)	at org.eclipse.cdt.core.settings.model.extension.impl.CDefaultConfigurationData.copySettingsFrom(CDefaultConfigurationData.java:113)	at org.eclipse.cdt.internal.core.settings.model.CConfigurationDescriptionCache.loadData(CConfigurationDescriptionCache.java:150)	at org.eclipse.cdt.internal.core.settings.model.CProjectDescription.loadDatas(CProjectDescription.java:196)	at org.eclipse.cdt.internal.core.settings.model.xml.XmlProjectDescriptionStorage.loadProjectDescription(XmlProjectDescriptionStorage.java:500)	at org.eclipse.cdt.internal.core.settings.model.xml.XmlProjectDescriptionStorage.getProjectDescription(XmlProjectDescriptionStorage.java:237)	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescriptionInternal(CProjectDescriptionManager.java:437)	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:419)	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:413)	at org.eclipse.cdt.internal.core.settings.model.CProjectDescriptionManager.getProjectDescription(CProjectDescriptionManager.java:406)	at org.eclipse.cdt.core.model.CoreModel.getProjectDescription(CoreModel.java:1424)	at org.eclipse.cdt.internal.core.index.IndexFactory.safeAddProvidedFragments(IndexFactory.java:170)	at org.eclipse.cdt.internal.core.index.IndexFactory.getIndex(IndexFactory.java:75)	at org.eclipse.cdt.internal.core.pdom.PDOMManager.getIndex(PDOMManager.java:1222)	at org.eclipse.cdt.internal.ui.search.actions.OpenDeclarationsJob.performNavigation(OpenDeclarationsJob.java:144)	at org.eclipse.cdt.internal.ui.search.actions.OpenDeclarationsJob.run(OpenDeclarationsJob.java:130)	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)