public ErrPtg(int errorCode) 
{
        
        if(!HSSFErrorConstants.isValidCode(errorCode)) {
            throw new IllegalArgumentException("Invalid error code (" + errorCode + ")");
        }
        field_1_error_code = errorCode;
}

Creates new ErrPtg

 public ErrPtg(RecordInputStream in) 
{
        this(in.readByte());
}

 public int getErrorCode() 
{
        return field_1_error_code;
}

 public int getSize() 
{
        return SIZE;
}

 public String toFormulaString(HSSFWorkbook book) 
{
        return HSSFErrorConstants.getText(field_1_error_code);
}

 public  void writeBytes(byte[] array,
    int offset) 
{
        array[offset] = (byte) (sid + getPtgClass());
        array[offset + 1] = (byte)field_1_error_code;
}