not use jsoncpp api but throw "in Json::Value::resolveReference(key, end): requires objectValue " error

[QAiStudio]

Describe the bug
A clear and concise description of what the bug is. hello！I used the jsoncpp 1.7.4 library to execute the following code, but this code does not contain any operations related to JSON. After conducting a detailed log analysis, it was found that when the "CreateAI" function failed to execute and execute void* ptr=AIF->create(jsonStr);, this error occurred. Because of myGraph* create(std::string jsonStr), and from the log it seems that std::cout<<"json: "<<jsonStr<<std::endl was not printed. Then the error was reported as "in Json::Value::resolveReference(key, end): requires objectValue"

void* CreateAI(void* factory, const char* jsonStr)
{
AIFactory* AIF=static_cast<AIFactory*>(factory);
if(AIF)
{
std::cout<<"Conversion successful "<<AIF<<std::endl;
}
else
std::cout<<"Conversion failed"<<std::endl;
void* ptr=AIF->create(jsonStr);
return ptr;
}
myGraph* create(std::string jsonStr)
{
try
{
std::cout<<"json："<<jsonStr<<std::endl;
if(stringToTxt(jsonStr,"./CreateAI_log.txt"))
std::cout<<"CreateAI json is saved"<<std::endl;
else
std::cout<<"CreateAI json save ERROR"<<std::endl;
auto ai=new myGraph(jsonStr);
AIs.push_back(ai);
return ai;/* */
}
catch(const std::exception& e)
{
std::cerr <<"myGraph: "<< e.what() << '\n';
}

}

To Reproduce
Steps to reproduce the behavior:
1.

Expected behavior
A clear and concise description of what you expected to happen.

Desktop (please complete the following information):
jsoncpp 1.7.4 3.1ubuntu2

NAME="Ubuntu"
VERSION="20.04.5 LTS (Focal Fossa)"
ID=ubuntu
ID_LIKE=debian
PRETTY_NAME="Ubuntu 20.04.5 LTS"
VERSION_ID="20.04"
HOME_URL="https://www.ubuntu.com/"
SUPPORT_URL="https://help.ubuntu.com/"
BUG_REPORT_URL="https://bugs.launchpad.net/ubuntu/"
PRIVACY_POLICY_URL="https://www.ubuntu.com/legal/terms-and-policies/privacy-policy"
VERSION_CODENAME=focal
UBUNTU_CODENAME=focal

Architecture: x86_64
CPU op-mode(s): 32-bit, 64-bit
Byte Order: Little Endian
Address sizes: 46 bits physical, 57 bits virtual
CPU(s): 144
On-line CPU(s) list: 0-143
Thread(s) per core: 2
Core(s) per socket: 36
Socket(s): 2
NUMA node(s): 4
Vendor ID: GenuineIntel
CPU family: 6
Model: 106
Model name: Intel(R) Xeon(R) Platinum 8352V CPU @ 2.10GHz
Additional context
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