Incorrect file format error while importing spreadjs

I am getting invalid file format error while importing spreadjs

loadSpreadSheet(assetFile: any) {
let fileContent = assetFile.fileContent;
const uint8Array = Uint8Array.from(atob(fileContent), c => c.charCodeAt(0));
const blb = new Blob([uint8Array])
const file = new File([blb], 'abc.xlsx', { type: "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet" });

if (!file) {
return;
}
var options: any = this.getOptions('open');
this.changedetector.detectChanges();
this.spread.import(file, function () { console.log("succ") }, function (error) { console.log(error) }, { fileType: GC.Spread.Sheets.FileType.excel });
this.changedetector.detectChanges();
}


The same above code is working fine in my POC. But when I am integrating the same code in my Realtime application I am getting this below error

Only different is, This code is available inside library which is binding in iFrame.

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