Warning: include(C:\Work\rnia\lib\vendor\phpspreadsheet\markbaker\matrix\examples/../vendor/autoload.php): failed to open stream: No such file or directory in C:\Work\rnia\lib\vendor\phpspreadsheet\markbaker\matrix\examples\test.php on line 3

Warning: include(): Failed opening 'C:\Work\rnia\lib\vendor\phpspreadsheet\markbaker\matrix\examples/../vendor/autoload.php' for inclusion (include_path='C:\xampp_564\php\PEAR') in C:\Work\rnia\lib\vendor\phpspreadsheet\markbaker\matrix\examples\test.php on line 3

Fatal error: Class 'Matrix\Matrix' not found in C:\Work\rnia\lib\vendor\phpspreadsheet\markbaker\matrix\examples\test.php on line 15