PHP Fatal error: Uncaught Error: Class 'PhpParser\Node\Scalar\String' not found

[jonnyleigh]

transform: ..\clientapi/vendor/symfony/http-foundation/Session/Storage/MockFileSessionStorage.php PHP Fatal error: Uncaught Error: Class 'PhpParser\Node\Scalar\String' not found in C:\Users\jonny\Source\Repos\BrilliantApp\php-code-downgrade\vendor\endel\galapagos\src\php54\SessionHandling.php:19 Stack trace: #0 C:\Users\jonny\Source\Repos\BrilliantApp\php-code-downgrade\vendor\nikic\php-parser\lib\PhpParser\NodeTraverser.php(120): galapagos\php54\SessionHandling->enterNode(Object(PhpParser\Node\Expr\FuncCall)) #1 C:\Users\jonny\Source\Repos\BrilliantApp\php-code-downgrade\vendor\nikic\php-parser\lib\PhpParser\NodeTraverser.php(84): PhpParser\NodeTraverser->traverseArray(Array) #2 C:\Users\jonny\Source\Repos\BrilliantApp\php-code-downgrade\vendor\nikic\php-parser\lib\PhpParser\NodeTraverser.php(129): PhpParser\NodeTraverser->traverseNode(Object(PhpParser\Node\Stmt\If_)) #3 C:\Users\jonny\Source\Repos\BrilliantApp\php-code-downgrade\vendor\nikic\php-parser\lib\PhpParser\NodeTraverser.php(84): PhpParser\NodeTraverser->traverseArray(Array) #4 C:\Users\jonny\Source\Repos\BrilliantApp\php-code-downgrade\vendor\nikic\php-parser\ in C:\Users\jonny\Source\Repos\BrilliantApp\php-code-downgrade\vendor\endel\galapagos\src\php54\SessionHandling.php on line 19