java.lang.IllegalArgumentException: Argument for @NotNull parameter 'mergeRequestListWorker' of com/ppolivka/gitlabprojects/merge/list/GitLabMergeRequestListDialog.<init> must not be null

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neither 'Create Merge Request' nor 'list merge requests' works in webstorm and intellij idea

Argument for @NotNull parameter 'mergeRequestListWorker' of com/ppolivka/gitlabprojects/merge/list/GitLabMergeRequestListDialog.<init> must not be null

java.lang.IllegalArgumentException: Argument for @NotNull parameter 'mergeRequestListWorker' of com/ppolivka/gitlabprojects/merge/list/GitLabMergeRequestListDialog.<init> must not be null	at com.ppolivka.gitlabprojects.merge.list.GitLabMergeRequestListDialog.<init>(GitLabMergeRequestListDialog.java)	at com.ppolivka.gitlabprojects.merge.list.GitLabMergeRequestListAction.apiValidAction(GitLabMergeRequestListAction.java:23)	at com.ppolivka.gitlabprojects.common.GitLabApiAction.actionPerformed(GitLabApiAction.java:58)	at com.intellij.openapi.actionSystem.ex.ActionUtil.performActionDumbAware(ActionUtil.java:182)	at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter$1.run(ActionMenuItem.java:311)	at com.intellij.openapi.wm.impl.FocusManagerImpl.runOnOwnContext(FocusManagerImpl.java:958)	at com.intellij.openapi.wm.impl.IdeFocusManagerImpl.runOnOwnContext(IdeFocusManagerImpl.java:124)	at com.intellij.openapi.actionSystem.impl.ActionMenuItem$ActionTransmitter.actionPerformed(ActionMenuItem.java:281)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2022)	at com.intellij.openapi.actionSystem.impl.ActionMenuItem.fireActionPerformed(ActionMenuItem.java:109)	at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2348)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:402)	at javax.swing.JToggleButton$ToggleButtonModel.setPressed(JToggleButton.java:308)	at javax.swing.AbstractButton.doClick(AbstractButton.java:376)	at com.apple.laf.ScreenMenuItemCheckbox.itemStateChanged(ScreenMenuItemCheckbox.java:193)	at java.awt.CheckboxMenuItem.processItemEvent(CheckboxMenuItem.java:389)	at java.awt.CheckboxMenuItem.processEvent(CheckboxMenuItem.java:357)	at java.awt.MenuComponent.dispatchEventImpl(MenuComponent.java:351)	at java.awt.MenuComponent.dispatchEvent(MenuComponent.java:339)	at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:761)	at java.awt.EventQueue.access$500(EventQueue.java:97)	at java.awt.EventQueue$3.run(EventQueue.java:709)	at java.awt.EventQueue$3.run(EventQueue.java:703)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:86)	at java.awt.EventQueue$4.run(EventQueue.java:731)	at java.awt.EventQueue$4.run(EventQueue.java:729)	at java.security.AccessController.doPrivileged(Native Method)	at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:76)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:728)	at com.intellij.ide.IdeEventQueue.defaultDispatchEvent(IdeEventQueue.java:866)	at com.intellij.ide.IdeEventQueue._dispatchEvent(IdeEventQueue.java:654)	at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:381)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)