OpenVINO - "Error: Failure due to generic standard exception" when running inference on FPGA

Hello, I have got an error when running inference on "HETERO:FPGA,CPU" with OpenVINO. Below are the full error log:

[ INFO ] InferenceEngine:
        API version ............ 1.0
        Build .................. 9911
[ INFO ] Parsing input parameters
[ INFO ] Loading plugin
 
        API version ............ 1.0
        Build .................. heteroPlugin
        Description ....... heteroPlugin
[ INFO ] Loading network files:
        
[ INFO ] Preparing input blobs
[ INFO ] Batch size is 1
[ INFO ] Preparing output blobs
[ INFO ] Loading model to the plugin
Graph Error Code: 78
Graph Error Description: Error: Incorrect layout type of the output primitive.
Sequence: 1
Subgraph: 1
Primitive: 9
Type: Output
File: api/src/dla_graph_assembler.cpp
Function: compute_output_primitive_params
Line #: 1122
[ ERROR ] Error: Failure due to generic standard exception

The FPGA I used is Arria 10 on a PAC card and the neural network model is just a simple AlexNet-like binary classifier. The inference engine runs successfully when it only uses the CPU plugin.

Have anyone experienced the same problem before? I appreciate any insights you guys might have.

Thanks.