Exporting excel chart to PNG - a generic error occurred in GDI+ - VB.NET

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VB

My application creates a chart in Excel, then exports the chart as a .png file.

It works fine the first time i generate a chart, But when i do it a second time i get this error.

An unhandled exception of type System.Runtime.InteropServices.ExternalException; occurred in System.Drawing.dll
Additional information: A generic error occurred in GDI+

Code where i get an error.

Dim workbook As New Workbook()
       workbook.LoadFromFile("Test.xls")
       Dim sheet As Worksheet = workbook.Worksheets(0)
       Dim imgs As Image() = workbook.SaveChartAsImage(sheet)
        imgs(0).Save(String.Format("img-0.png", ImageFormat.Png)) 'Gets first chart from excel (Error on this line)


       Me.PictureBox2.SizeMode = System.Windows.Forms.PictureBoxSizeMode.StretchImage
       Me.PictureBox2.TabIndex = 1
       Me.PictureBox2.TabStop = False
      

       PictureBox2.Image = Image.FromFile("img-0.png")

Thanks

What I have tried:

I tried to dispose the bitmap/image, But i have no clue how to successfully do it. I Also tried to copy the image and use the copied image in my picturebox. This allows me to generate charts a second time before the error occurs.

I think i know what the problem is (Bitmap is busy somewhere), but i do not understand to fully resolve it.