adlibout: error: cannot get table of contents in library file

Hi All,
encountered the following errors when applying customer specific files using adpatch options=hotpatch,phtofile :

---wps----------------------------------------
Extracting object modules for product wps...
ar: /apprd/apps/apps_st/appl/wps/12.0.0/lib/libwps.a not in archive format

adlibout: error: cannot get table of contents in library file for product wps
File name is /apprd/apps/apps_st/appl/wps/12.0.0/lib/libwps.a
Skipping to next product...


---wsm----------------------------------------
Extracting object modules for product wsm...
ar: /apprd/apps/apps_st/appl/wsm/12.0.0/lib/libwsm.a not in archive format

adlibout: error: cannot get table of contents in library file for product wsm