Hey @kun2917,
Which version of HailoRT are you using on your RPI5? This issue is often due to version compatibility. Please make sure you’re using either HailoRT 4.17 with DFC 3.27 and tappas or HailoRT 4.18 with DFC 3.28, along with the latest Tappas.
Please check out this topic : gst-inspect-1.0 hailo: No such element or plugin 'hailo'