Forums - Unsupported UserBufferEncodingUnsigned8Bit ?

I tried to use "UserBufferEncodingUnsigned8Bit" in SNPE 1.54.

I created the user buffer by referring to the following sample : 

<SNPE_ROOT>/examples/NativeCpp/SampleCode/jni/CreateUserBuffer.cpp

But it was not created correctly, and I got this error :

error_code=240; error_message=Buffer element encoding not supported by API. Unimplemented encoding type UNSIGNED8BIT;

Can't I use  "UserBufferEncodingUnsigned8Bit" in SNPE 1.54 or latest version? 

The code is

userBufferEncoding = std::unique_ptr<zdl::DlSystem::UserBufferEncodingUnsigned8Bit>(new zdl::DlSystem::UserBufferEncodingUnsigned8Bit());

...

// create SNPE user buffer from the user-backed buffer

zdl::DlSystem::IUserBufferFactory& ubFactory = zdl::SNPE::SNPEFactory::getUserBufferFactory();

snpeUserBackedBuffers.push_back(ubFactory.createUserBuffer(applicationBuffers.at(name).data(),

                                                              bufSize,

                                                              strides,

                                                              userBufferEncoding.get()));