How can solved this trouble with an exception in An exception of type 'com.google.zxing.ReaderException' occurred in zxing.dll?

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C++

I am used a library to read qr code, but i have an error with an exception in An exception of type 'com.google.zxing.ReaderException' occurred in zxing.dll but was not handled in user code

If there is a handler for this exception, the program may be safely continued.


the code is:

private FinderPattern[] selectBestPatterns()
        {

            int startSize = possibleCenters.Count;
            if (startSize < 3)
            {
                // Couldn't find enough finder patterns
                throw ReaderException.Instance;
            }

            // Filter outlier possibilities whose module size is too different
            if (startSize > 3)
            {
                // But we can only afford to do so if we have at least 4 possibilities to choose from
                float totalModuleSize = 0.0f;
                for (int i = 0; i < startSize; i++)
                {
                    totalModuleSize += ((FinderPattern) possibleCenters[i]).EstimatedModuleSize;
                }
                //UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
                float average = totalModuleSize / (float) startSize;
                for (int i = 0; i < possibleCenters.Count && possibleCenters.Count > 3; i++)
                {
                    FinderPattern pattern = (FinderPattern) possibleCenters[i];
                    if (System.Math.Abs(pattern.EstimatedModuleSize - average) > 0.2f * average)
                    {
                        possibleCenters.RemoveAt(i);
                        i--;
                    }
                }
            }

            if (possibleCenters.Count > 3)
            {
                // Throw away all but those first size candidate points we found.
                Collections.insertionSort(possibleCenters, new CenterComparator());
                SupportClass.SetCapacity(possibleCenters, 3);
            }

            return new FinderPattern[]{(FinderPattern) possibleCenters[0], (FinderPattern) possibleCenters[1], (FinderPattern) possibleCenters[2]};
        }

        /// <summary> <p>Orders by {@link FinderPattern#getCount()}, descending.</p></summary>
        private class CenterComparator : Comparator
        {
            public virtual int compare(System.Object center1, System.Object center2)
            {
                return ((FinderPattern) center2).Count - ((FinderPattern) center1).Count;
            }
        }
    }