Warning: Name is nonexistent or not a directory

Every time I start up MATLAB, I receive this message:

Warning: Name is nonexistent or not a directory:
C:\POSTDOC\vlfeat\toolbox\mexw32.
Warning: Name is nonexistent or not a directory:
C:\POSTDOC\vlfeat\toolbox\special.
Warning: Name is nonexistent or not a directory:
C:\POSTDOC\vlfeat\toolbox\sift.
Warning: Name is nonexistent or not a directory:
C:\POSTDOC\vlfeat\toolbox\plotop.
Warning: Name is nonexistent or not a directory:
C:\POSTDOC\vlfeat\toolbox\mser.
Warning: Name is nonexistent or not a directory:
C:\POSTDOC\vlfeat\toolbox\misc.
Warning: Name is nonexistent or not a directory:
C:\POSTDOC\vlfeat\toolbox\kmeans.
Warning: Name is nonexistent or not a directory:
C:\POSTDOC\vlfeat\toolbox\imop.
Warning: Name is nonexistent or not a directory:
C:\POSTDOC\vlfeat\toolbox\geometry.
Warning: Name is nonexistent or not a directory:
C:\POSTDOC\vlfeat\toolbox\aib.
Warning: Name is nonexistent or not a directory:
C:\POSTDOC\vlfeat\toolbox.
Warning: Name is nonexistent or not a directory: xml_toolbox.
Warning: Name is nonexistent or not a directory:
C:\POSTDOC\Hand_Mathias\videoIO.
解决方案：
restoredefaultpath
savepath