Internal Error: Sub-system: ATCL, File: /quartus/ccl/atcl/atcl_root.cpp, Line: 987 - Internal Error: Sub-system: ATCL, File: /quartus/ccl/atcl/atcl_root.cpp, Line: 987 Description Due to a problem in the Intel® Quartus® Prime Pro edition software version 19.2 for Windows*, you may see this internal error message when the fitter stage is being executed. The internal error description will include a DLL module that could not be found by Windows* operating system. e.g. ERROR: Can't load library: c:\\intelfpga_pro\19.2\quartus\bin64\fitter_fdrgn.dll. The operating system reports the following error: The specified module could not be found. Resolution To work around this problem, install the Visual C Redistributable Packages for Visual Studio 2013 from the following link . Custom Fields values: ['novalue'] Troubleshooting 2007807743 False ['novalue'] ['FPGA Dev Tools Quartus® Prime Software Pro'] 19.3 19.2 ['Programmable Logic Devices'] ['novalue'] ['novalue'] ['novalue']