The method setBars() does not exist on CMEN\GoogleChartsBundle\...s\ChartOptionsInterface. It seems like you code against a sub-type of CMEN\GoogleChartsBundle\...s\ChartOptionsInterface such as CMEN\GoogleChartsBundle\...rial\ColumnChartOptions or CMEN\GoogleChartsBundle\...aterial\BarChartOptions.
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Ignorable by Annotation
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If this is a false-positive, you can also ignore this issue in your code via the ignore-call annotation
The expression return $this->options returns the type CMEN\GoogleChartsBundle\...s\ChartOptionsInterface which includes types incompatible with the type-hinted return CMEN\GoogleChartsBundle\...aterial\BarChartOptions.