This error is basicly saying that your WASM binary may contain a function call 
which can not be handled in the WASM runtime (sandbox). Please make sure your 
code doesn't contain any syscalls and functions defined outside, except the 
Teaclave context file interfaces. You may refer to [this 
document](https://teaclave.apache.org/docs/executing-wasm/) for the 
restrictions:

> 1. Be self-contained: not depending on libraries which are not provided by 
> Teaclave, including standard libraries.
> 2. Contains no syscall: no system call-related code.
> 3. Implement required interface: exporting an int entrypoint(int argc, char* 
> argv[]) function which is compatible with Teaclave WAMR calling convention 
> (see examples for more details).

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