Tutorial - Dynamic symbolic execution, error syscall 218

[Katastropic2431]

This error occurs when I load the compiled code into the maat engine and set my libdirs to my library paths.
Not sure why I'm getting a 218 syscall as the source code doesn't use any threads. This '218' syscall occurs on other programs too so I am essentially at a dead end until I can find a fix for this. Any help will be appreciated.

Source code
To compile I used gcc crackmeNathan.c -o crackmeNathan

// crackmeNathan.c
#include <string.h>
#include <stdio.h>

unsigned long long transform(char* str){
    unsigned long long res = 0;
    for( int i = 0; str[i] != '\0'; i++ ){
        res = res << 8;
        res = res + ((str[i]*7 - 0x20) & 0xff);
    }
    return res;
}

int main(int argc, char ** argv){
    char serial[256];
    // Get serial
    printf("Enter the 8-characters serial: ");
    if( !scanf("%s", serial))
        return 1;
    if( strlen(serial) != 8 ){
        printf("Serial length must be 8\n");
        return 1;
    }
    
    // Check serial
    if( transform(serial) == 0x378ed80c535a3630 ){
        printf("Correct!\n");
    }else{
        printf("Wrong!\n");
    }

   return 0;
}

Maat Code

# solve.py
from maat import *
m = MaatEngine(ARCH.X64, OS.LINUX)
m.load("crackmeNathan", BIN.ELF64, base=0x04000000, libdirs=['/usr/lib64', '/usr/lib/x86_64-linux-gnu'])
# Fill stdin with 8-bytes concolic input
# Note: On a single-process linux environment, stdin handle is always 0 
stdin = m.env.fs.get_fa_by_handle(0)
buf = m.vars.new_concolic_buffer(
    "input",
    b'aaaaaaaa',
    nb_elems=8,
    elem_size=1,
    trailing_value=ord('\n') # concrete new line at the end of the input
)
stdin.write_buffer(buf)
# <previous part of the solve.py script>

# Add hook on symbolic branch
def find_serial(m: MaatEngine):
    if m.info.addr == 0x040008b1: # We care only about that particular branch
        s = Solver()
        s.add(m.info.branch.cond.invert())
        if s.check():
            model = s.get_model()
            print(f"Found serial: {model.get_as_str('input')}")
        else:
            print("Failed to find serial")
        return ACTION.HALT
    
m.hooks.add(EVENT.PATH, WHEN.BEFORE, callbacks=[find_serial])

# Run analysis
m.run()

Error code
[Info] Adding object 'ld-linux-x86-64.so.2' to virtual fs at '/usr/lib/ld-linux-x86-64.so.2'
[Info] Adding object 'libc.so.6' to virtual fs at '/usr/lib/libc.so.6'
[Info] Adding object 'crackmeNathan' to virtual fs at '/crackmeNathan'
[Error] Exception in CALLOTHER handler: SYSCALL: EnvEmulator: syscall '218' not supported for emulation
[Error] Unexpected error when processing IR instruction, aborting...