strlen() expects parameter 1 to be string, array given

[rasasak]

I try this plugin... choose root person, set output DOT

but i have these errors
strlen() expects parameter 1 to be string, array given …/modules_v4/GVExport/utils.php:54
#0 …/modules_v4/GVExport/utils.php(54): Fisharebest\Webtrees\Webtrees::Fisharebest\Webtrees\{closure}(2, 'strlen() expect...','/data/web/virtu...', 54, Array)
#1 …/modules_v4/GVExport/utils.php(17): is__writable(Array, 'TMPDIR')
#2 …/modules_v4/GVExport/module.php(269): sys_get_temp_dir_my()
#3 …/modules_v4/GVExport/module.php(206): vendor\WebtreesModules\gvexport\GVExport>saveDOTFile(Object(Fisharebest\Webtrees\Tree), Object(Fisharebest\Webtrees\Individual), true)
....

any ideas ? :(