Issue: Uprading error

Upgrading to 4.0.15
Step 2

Removing entries from table: vw_blockcache
An exception occurred: opendir(/tmp): failed to open dir: Permission denied in [path]/vault/install/lib/upgradepath/steps/4/0/15/C/xf.php on line 61
#0: XenForo_Application::handlePhpError()
#1: opendir() in [path]/vault/install/lib/upgradepath/steps/4/0/15/C/xf.php at line 61
#2: vw_Install_UpgradePath_Steps_4015_C_Controller_XF->{closure}() in [path]/vault/core/controller/progress/steps/vw.php at line 83
#3: vw_Progress_Steps_Controller->call() in [path]/vault/core/controller/progress/steps/vw.php at line 53
#4: vw_Progress_Steps_Controller->execute() in [path]/vault/install/lib/upgradepath/vw.php at line 60
#5: vw_Install_UpgradePath_Controller->exec_script() in [path]/vault/core/controller/progress/vw.php at line 74
#6: vw_Progress_Controller->execute() in [path]/vault/core/controller/cp/progress/vw.php at line 34
#7: vw_CP_Progress_Controller->process() in [path]/vault/core/controller/cp/install/vw.php at line 275
#8: vw_CP_Install_Controller->upgrade() in [path]/vault/core/controller/cp/install/vw.php at line 57
#9: vw_CP_Install_Controller->execute() in [path]/library/vw/XenForo/ControllerAdmin/Wiki.php at line 118
#10: vw_XenForo_ControllerAdmin_Wiki->actionIndex() in [path]/library/vw/XenForo/ControllerAdmin/Wiki.php at line 176
#11: vw_XenForo_ControllerAdmin_Wiki->actionUpgrade() in [path]/library/XenForo/FrontController.php at line 351
#12: XenForo_FrontController->dispatch() in [path]/library/XenForo/FrontController.php at line 134
#13: XenForo_FrontController->run() in [path]/admin.php at line 13