Cannot load Packet Format Converter Element Class. Make sure SOPC Builder is installed. - Cannot load Packet Format Converter Element Class. Make sure SOPC Builder is installed. Description You may see this error in DSP Builder v14.1 if your design uses the Avalon ST Packet Format Converter block. The block is in the DSP Builder standard blockset Interface/Avalon Streaming library of Altera DSp Builder Standard Blockset . Resolution To work around this problem, delete the block from your design. This problem is scheduled to be fixed in a future version of DSP Builder Custom Fields values: ['novalue'] Troubleshooting novalue True ['novalue'] ['FPGA Dev Tools Quartus II Software'] novalue 14.1 ['Programmable Logic Devices'] ['DSP Builder for Pro Edition'] ['novalue'] ['novalue']