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'NoneType' object has no attribute 'removeItem'

1

here is my code: ``` plotItem = pg.PlotItem() plotItem.setAxisItems(axisItems={'bottom':pg.AxisItem('bottom')}) ``` when I run this code, it shows the error as below ``` Traceback (most recent call last): File "E:\Workspace\Python\VNPY-master\examples\candle_chart\tick\item\main.py", line...

what does the spring-boot-example moduledo? T have run the FlowableSpringBootExampleApplication class in spring-boot-example module, but how can I use the flowable service? or how can I find something in web?