How to get MSL coordinates during EDL from SPICE kernel?

Question

Upon trying to extract MSL position above surface by decoding a SPICE kernel, I am gettin this error:

At epoch 3.9750216818313E+08 TDB (2012 AUG 06 05:16:08.183 TDB), there is insufficient information available to transform from reference frame -76000 (MSL_ROVER) to reference frame 1 (J2000). MSL_ROVER is a CK frame; a CK file containing data for instrument or structure -76000 at the epoch shown above, as well as a corresponding SCLK kernel, must be loaded in order to use this frame.

But I don't understand WHERE I mentioned MSL_ROVER in my source! I am recyclying the source for the rover, but I thought I removed any reference from it!

This is my code; I removed all the parts related to rover from the original source:

import * as TimeCraft from '../src/index.js';
window.TimeCraft = TimeCraft;

( async function() {

    console.log("Loading...");
    const buffers = await Promise.all([
        // kernels from
        // https://naif.jpl.nasa.gov/pub/naif/pds/data/msl-m-spice-6-v1.0/mslsp_1000/extras/mk/msl_chronos_v07.tm
        '../kernels/lsk/naif0012.tls',
        '../kernels/spk/de425s.bsp',

        '../kernels/sclk/msl_76_sclkscet_00016.tsc',
        '../kernels/sclk/msl_lmst_ops120808_v1.tsc',

        '../kernels/pck/pck00008.tpc',

        //'../kernels/spk/msl_cruise.bsp',
        '../kernels/spk/msl_edl_v01.bsp',
        //'../kernels/spk/msl_ls_ops120808_iau2000_v1.bsp',
        //'../kernels/spk/msl_atls_ops120808_v1.bsp',

        '../kernels/fk/msl_v08.tf',
    ].map( p => fetch( p ).then( res => res.arrayBuffer() ) ) );

    buffers.forEach( buffer => {

        TimeCraft.loadKernel( buffer );

    } );

    const utcEl = document.querySelector('[name="utc"]');
    const etEl = document.querySelector('[name="et"]');
    const lstEl = document.querySelector('[name="mars lst"]');
    const lmstEl = document.querySelector('[name="msl lmst"]');
    const sclkEl = document.querySelector('[name="msl sclk"]');
    const sunEl = document.querySelector('[name="msl sun direction"]');
    const MSL = document.querySelector('[name="MSL"]');
    const EDLutc = document.querySelector('[name="EDLutc"]');

    console.log("Done.");

    let EDLstartJStimeMs =  new Date("2012-AUG-06 05:15:00 00Z").getTime();
    let EDKcurrJStimeMs = EDLstartJStimeMs;

    setInterval(() => {

        //let utc = new Date().toISOString();

        EDKcurrJStimeMs += 1000;
        let utcEDL = new Date(EDKcurrJStimeMs).toISOString(); // Last: 05:19:04
console.log( utcEDL);

        //utc = utc.slice(0, utc.length - 1);
        utcEDL = utcEDL.slice(0, utcEDL.length - 1);
console.log(utcEDL);

        const etEDL = TimeCraft.Spice.utc2et(utcEDL);
console.log( etEDL);

        // See conversion code outlined in
        // https://naif.jpl.nasa.gov/pub/naif/pds/data/msl-m-spice-6-v1.0/mslsp_1000/data/sclk/msl_76_sclkscet_00016.tsc

        //const sunPos = TimeCraft.Spice.spkpos('SUN', et, 'MSL_TOPO', 'LT+S', '-76').ptarg;
const MSLpos = TimeCraft.Spice.spkpos('-76', etEDL, 'J2000', 'LT+S', '499').ptarg;

        //sunEl.childNodes[0].textContent = `${sunDir[0].toFixed(4)}, ${sunDir[1].toFixed(4)}, ${sunDir[2].toFixed(4)}`;

MSL.childNodes[0].textContent = `${MSLpos[0].toFixed(4)}, ${MSLpos[1].toFixed(4)}, ${(MSLpos[2]-3376.2).toFixed(4)}`;
        EDLutc.childNodes[0].textContent = utcEDL;
console.log("------------------");
        // mars radius: 3376.2 km
        // Last available date for EDL: 2012-Aug-06 05:19:04.0000
        // MSL EDL kernel: https://naif.jpl.nasa.gov/pub/naif/MSL/kernels/spk/


    }, 1000);

} )();

The key statement is:

TimeCraft.Spice.spkpos('-76', etEDL, 'J2000', 'LT+S', '499').

...based on Timecraft library and the spkpos() function it exposes.

"-76" is MSL, not the rover, so why does the libraty complain about referring the rover?

Kernels are here:

https://naif.jpl.nasa.gov/pub/naif/MSL/kernels/spk/

MSL EDL kernel: https://naif.jpl.nasa.gov/pub/naif/MSL/kernels/spk/msl_edl_v01.bsp

---

After additional testing:

This line:

const MSLpos = TimeCraft.Spice.spkpos('MSL', etEDL, 'IAU_MARS', 'LT+S', 'MARS').ptarg;

causes error:

At epoch 3.9750156818313E+08 TDB (2012 AUG 06 05:06:08.183 TDB), there is insufficient information available to transform from reference frame -76000 (MSL_ROVER) to reference frame 1 (J2000).

in cspice.js:3

This line:

const MSLpos = TimeCraft.Spice.spkpos('MSL_SPACECRAFT', etEDL, 'IAU_MARS', 'LT+S', 'MARS').ptarg;

causes error:

Insufficient ephemeris data has been loaded to compute the position of -76010 (MSL_SPACECRAFT) relative to 0 (SOLAR SYSTEM BARYCENTER) at the ephemeris epoch 2012 AUG 06 05:06:08.183

Kernel msl_v08.tf contains these data:

• MSL -76
• MSL_ROVER -76000
• MSL_SPACECRAFT -76010