2016-09-01 16:48:20,625 ERROR info.magnolia.rendering.engine.RenderingFilter    : Can't log template exception.
java.lang.RuntimeException: Can't log template exception.
        at info.magnolia.rendering.engine.ModeDependentRenderExceptionHandler.handleException(ModeDependentRenderExceptionHandler
.java:98)
        at info.magnolia.rendering.context.AggregationStateBasedRenderingContext.handleException(AggregationStateBasedRenderingCo
ntext.java:202)
        at info.magnolia.rendering.engine.DefaultRenderingEngine.render(DefaultRenderingEngine.java:108)
        at info.magnolia.rendering.engine.DefaultRenderingEngine$$EnhancerByCGLIB$$2b5737c4.render(<generated>)
        at info.magnolia.rendering.engine.RenderingFilter.render(RenderingFilter.java:204)
        at info.magnolia.rendering.engine.RenderingFilter.handleTemplateRequest(RenderingFilter.java:139)
        at info.magnolia.rendering.engine.RenderingFilter.doFilter(RenderingFilter.java:91)
        at info.magnolia.cms.filters.AbstractMgnlFilter.doFilter(AbstractMgnlFilter.java:85)
        at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at info.magnolia.rendering.model.ModelExecutionFilter.doFilter(ModelExecutionFilter.java:101)
        at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:58)
        at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at info.magnolia.personalization.filter.VariantResolverFilter.doFilter(VariantResolverFilter.java:103)
        at info.magnolia.cms.filters.OncePerRequestAbstractMgnlFilter.doFilter(OncePerRequestAbstractMgnlFilter.java:58)
        at info.magnolia.cms.filters.MgnlFilterChain.doFilter(MgnlFilterChain.java:80)
        at info.magnolia.cms.filters.AggregatorFilter.doFilter(AggregatorFilter.java:103)
……………………………
Caused by: java.io.IOException: Can't use appendable and output stream in parallel. getOutputStream() was already called.
        at info.magnolia.rendering.engine.ResponseOutputProvider.getAppendable(ResponseOutputProvider.java:57)
        at info.magnolia.rendering.context.AggregationStateBasedRenderingContext.getAppendable(AggregationStateBasedRenderingContext.java:192)
        at info.magnolia.rendering.engine.ModeDependentRenderExceptionHandler.handleException(ModeDependentRenderExceptionHandler.java:84)
        ... 138 more