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

FAILED to read auto-discovery string at byte 44. Full auto-discovery string value is 17 143eef84a4bc814da7279519731272a09efb9e52 pac_a10 0 0 2 1024 0 4294967296 4294967296 8589934592 0 6 DLA_VERSION_4_3x3x16x64_fp11_sb4096_i1_actk8_poolk8_normk8_owk8 0 128 0 0 1 0 1 0 0 0 0 1 1 1 3 1 1 1 0 bias_reader 256 128 0 0 1 0 1 0 1 2 1 8 0 0 1 1 1 3 1 1 1 0 config_reader 512 128 0 0 1 0 1 0 2 2 1 8 0 0 4 0 0 1 1 1 3 1 1 1 0 filter_reader 768 256 0 0 1 0 1 0 6 2 1 8 2 1 8 0 0 4 0 0 4 0 0 4 0 0 4 0 0 1 1 1 3 1 1 1 0 input_reader 1024 128 0 0 1 0 1 0 4 2 1 8 2 1 8 0 0 4 0 0 4 0 0 1 1 1 3 1 1 1 0 output_writer 1280 128 0 0 1 0 1 0 2 2 1 8 2 1 8 0 0 1 1 1 3 1 1 1 0 
acl_hal_mmd.c:1393:assert failure: Failed to initialize kernel interfacediagnose: acl_hal_mmd.c:1393: l_try_device: Assertion `0' failed.

this is the error

source /home/jiangjn/tools/inteldevstack/init_env.sh
export CL_CONTEXT_COMPILER_MODE_ALTERA=3
export CL_CONTEXT_COMPILER_MODE_INTELFPGA=3
export INTELFPGAOCLSDKROOT="/home/jiangjn/tools/inteldevstack/intelFPGA_pro/hld"
export ALTERAOCLSDKROOT="\$INTELFPGAOCLSDKROOT"
export AOCL_BOARD_PACKAGE_ROOT="/home/jiangjn/tools/inteldevstack/a10_gx_pac_ias_1_2_pv/opencl/opencl_bsp"
/home/jiangjn/tools/inteldevstack/a10_gx_pac_ias_1_2_pv/opencl/opencl_bsp/linux64/libexec/setup_permissions.sh
source /home/jiangjn/tools/inteldevstack/intelFPGA_pro/hld/init_opencl.sh
export IE_INSTALL="/opt/intel/openvino/deployment_tools"
source /opt/intel/openvino/bin/setupvars.sh
export PATH=$PATH:/home/jiangjn/inference_engine_samples_build/intel64/Release
alias mo="python3.6 \$IE_INSTALL/model_optimizer/mo.py"

this is my init_openvino.sh

what should I do to solve this problem?

I can run the hellworld sample,but there is still a problem when runing 2019R1_RC_FP11_ResNet_SqueezeNet_VGG.aocx