I am having the same issue in OpenVINO 2019R1. classification_sample but classification_sample -d HETERO:FPGA,CPU does not.

The aocx file that I used is 2019R1_RC_FP11_ResNet_SqueezeNet_VGG.aocx . I followed the step ,and I am running in root. The problem is the guide providing a runtime version. And I install the dev version in the right of the picture.

guide:https://docs.openvinotoolkit.org/latest/_docs_install_guides_PAC_Configure_2019R1.html