twain ocr function returns empty byte

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VB

OCR

TWAIN

i have the below code:

ddlResultFormat.Items.Add("Text")

dynamicDotNetTwain1.LoadImage("C:\Users\elj\Desktop\3b072e9b-76b4-4776-bd3c-5984074d8ecd.png")
Dim r = dynamicDotNetTwain1.GetImage(dynamicDotNetTwain1.CurrentImageIndexInBuffer).Width.ToString()
Dim l = dynamicDotNetTwain1.GetImage(dynamicDotNetTwain1.CurrentImageIndexInBuffer).Height.ToString()
Dim languageFolder As String
languageFolder = "C:\Program Files (x86)\Dynamsoft\Dynamic .NET TWAIN 5.2 Trial\Samples\Bin\"
Dim languages As New Dictionary(Of String, String)
languages.Add("English", "eng")
Me.dynamicDotNetTwain1.OCRTessDataPath = languageFolder
Me.dynamicDotNetTwain1.OCRLanguage = "English"

Dim ocrResultFormat As Dynamsoft.DotNet.TWAIN.OCR.ResultFormat
ocrResultFormat = CType(System.Enum.Parse(GetType(Dynamsoft.DotNet.TWAIN.OCR.ResultFormat), Val("&H" & 0)), Dynamsoft.DotNet.TWAIN.OCR.ResultFormat)
Me.dynamicDotNetTwain1.OCRResultFormat = ResultFormat.Text

Dim strDllPath As String
strDllPath = "C:\Program Files (x86)\Dynamsoft\Dynamic .NET TWAIN 5.2 Trial\Redistributable\OCRResources\"
dynamicDotNetTwain1.OCRDllPath = strDllPath

If (Me.dynamicDotNetTwain1.CurrentImageIndexInBuffer < 0) Then
    Dim jajajja = "Please load an image before doing OCR!"
End If

Dim sbytes As Byte()
sbytes = Me.dynamicDotNetTwain1.OCR(Me.dynamicDotNetTwain1.CurrentSelectedImageIndicesInBuffer)

the problem that i'm facing is that the sbytes byte array is being always set to empty although the indice in the buffer is correct and the paths and the dll are well implemented but the convert to the byte array is not being successful i'm not getting any exception but the length of the byte is 0

any idea how can i fix this?