Dynamics ax 4.0 EP, error downloading Invoice

Hi, when i try to get/download an invoice from enterprise portal in dynamics ax 4.0, the file is only 389 bytes. I cannot open afterwards.

I found this.

In class EPDocuGetWeblet the i get error on Bindata.loadFile

while(true)

{

           if (!binData.loadFile(tempFileName, fileOffset, #BUFFER_SIZE))
           {
                        
                    break;
            }

            fileOffset += #BUFFER_SIZE;
                    
           response.binaryWrite(binData.getVariant());

}

Second time bindata.loadFile is called i get false and end i break;

i have to warnings in Eventviewer on webserver.

Hope anyone can help me :)