Failed to locate 'tessdata\fra.traineddata even after successfully unpacking the language pack

ByChaknith Bin

March 29, 2023

Updated June 22, 2025

IronOCR requires permission to write to the runtimes folder during execution. If IronOCR is not authorized to access the runtimes folder, it could cause the following exception:

Exception: 'Failed to locate 'tessdata\fra.traineddata even after successfully unpacking the language pack'

This exception occurs because IronOCR could not find the unpacked language file in the tessdata folder.

IronOCR unpacks the .ocrdata language file from the OcrData folder to the tessdata folder deep in the runtime directory during execution if the file does not yet exist. Some virus protection applications, such as Windows Ransomware Protection, might restrict the write permission of IronOCR. Even if Visual Studio is authorized to access that directory, IronOCR may be denied.

Chaknith Bin

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Software Engineer

Chaknith works on IronXL and IronBarcode. He has deep expertise in C# and .NET, helping improve the software and support customers. His insights from user interactions contribute to better products, documentation, and overall experience.