jimp issue zlib error

async function jimpa(date, pos, hel, dec, difftw_pos, difftw_he, difftw_dec, tot, difftw_tot){

var fileName = 'covid.png';

var loadedImage;

await Jimp.read(fileName)
    .then(function (image) {
        loadedImage = image;
        return Jimp.loadFont('fonts/data/data.fnt');
    })
    .then(function (font) {
        loadedImage.print(font, 392, 246, date)
                   .write(fileName);

console.log("Writing data...");

    })
    .catch(function (err) {
        console.error(err);
    });

await Jimp.read(fileName)
    .then(function (image) {
        loadedImage = image;
        return Jimp.loadFont('fonts/stats/stats.fnt');
    })
    .then(function (font) {
        loadedImage.print(font, 388, 514, numtw(pos))
        loadedImage.print(font, 388, 900, numtw(hel))
        loadedImage.print(font, 388, 1287, numtw(dec))
                   .write(fileName);

console.log("Writing stats...");

    })
    .catch(function (err) {
        console.error(err);
    });

await Jimp.read(fileName)
    .then(function (image) {
        loadedImage = image;
        return Jimp.loadFont('fonts/stats-min/stats-min.fnt');
    })
    .then(function (font) {
        loadedImage.print(font, 917, 703, numtw(difftw_pos))
        loadedImage.print(font, 884, 1088, numtw(difftw_he))
        loadedImage.print(font, 1035, 1473, numtw(difftw_dec))
                   .write(fileName);

console.log("Writing diff stats...");

    })
    .catch(function (err) {
        console.error(err);
    });

await Jimp.read(fileName)
    .then(function (image) {
        loadedImage = image;
        return Jimp.loadFont('fonts/tot/tot.fnt');
    })
    .then(function (font) {
        loadedImage.print(font, 388, 1694, numtw(tot))
                   .write(fileName);

console.log("Writing tot cases...");

    })
    .catch(function (err) {
        console.error(err);
    });

await Jimp.read(fileName)
    .then(function (image) {
        loadedImage = image;
        return Jimp.loadFont('fonts/tot-min/tot-min.fnt');
    })
    .then(function (font) {
        loadedImage.print(font, 1340, 1911, numtw(difftw_tot))
                   .write(fileName);

console.log("Writing tot cases diff...");

    })
    .catch(function (err) {
        console.error(err);
    });

await exec("node convert.js");

}