ofxCv issue with opencv4

hi having a issue running example-flow-disort-shader the other examples work but
with this one i go

[notice ] ofGstUtils: setPipelineWithSink(): gstreamer pipeline: v4l2src name=video_source device=/dev/video0 ! video/x-raw,format=YUY2,width=640,height=480,framerate=30/1 ! videoconvert ! appsink name=ofappsink enable-last-sample=0 caps=“video/x-raw, format=RGB, width=640, height=480”
terminate called after throwing an instance of ‘cv::Exception’
what(): OpenCV(4.2.0) /build/opencv/src/opencv-4.2.0/modules/core/src/arithm.cpp:671: error: (-215:Assertion failed) type2 == CV_64F && (sz2.height == 1 || sz2.height == 4) in function ‘arithm_op’

/bin/sh: line 1: 24394 Aborted (core dumped) ./example-flow-distort-shader
make: *** [/home/jacos/OF/libs/openFrameworksCompiled/project/makefileCommon/compile.project.mk:191: RunRelease] Error 134

any idea what it is i can figure it out