json rpc error 32700 syntax error

<code>{"result":null,"error":{"code":-32700,"message":"Parse error"},"id":null}
</code>

How to solve it?

Reply content:

<code>{"result":null,"error":{"code":-32700,"message":"Parse error"},"id":null}
</code>

How to solve it?

Check whether the parameter json you requested is legal