Progress indicator doesn't show "indicating"

Hello, all

I tried to run backgroung process with indication, but it doesn't show "indicating", just empty line.
If I uncomment "getProgressIndicator().start()" line then it begins to work, but I have an assert exception.

               ProgressManager.getInstance().runProcessWithProgressSynchronously(new Runnable() {
                    @Override
                    public void run() {
                        //ProgressManager.getInstance().getProgressIndicator().start();
                        try {
                            antParser.init(antBuildFile);
                        } catch (BuildException e) {
                            logger.error("Error happened during initialization of Ant build file - " + e.getMessage());
                        }
                    }
                }, "Import '" + currentModule.getName() + "' dependencies", false, currentProject);