Converting Clarion 6 to Clarion 11

Hi All
I am busy converting all my clarion 6 apps to clarion 11 (build 13401)
when compiling app i get the following errors:-

Unresolved External DESTRUCT@F16ERRORSTATUSCLASS in Uni_bom.obj
Unresolved External VMT$ERRORSTATUSCLASS in Uni_bom.obj
Unresolved External CONSTRUCT@F16ERRORSTATUSCLASS in Uni_bom.obj
Unresolved External INIT@F10ERRORCLASS16ERRORSTATUSCLASS in Uni_bom.obj
Unresolved External OPEN@F13WINDOWMANAGERBwBw in Uni_bom001.obj
Unresolved External TAKENOTIFY@F13WINDOWMANAGERlll in Uni_bom001.obj
Unresolved External ONCLOSEEVENTCANCELLED@F13WINDOWMANAGER in Uni_bom001.obj
Unresolved External SETOPENRELATED@F15RELATIONMANAGER in Uni_bom001.obj
Unresolved External OPEN@F13WINDOWMANAGERBwBw in Uni_bom003.obj
Unresolved External TAKENOTIFY@F13WINDOWMANAGERlll in Uni_bom003.obj
Unresolved External ONCLOSEEVENTCANCELLED@F13WINDOWMANAGER in Uni_bom003.obj
Unresolved External SETOPENRELATED@F15RELATIONMANAGER in Uni_bom003.obj
Unresolved External SETOPENRELATED@F15RELATIONMANAGER in Uni_bom003.obj
Unresolved External OPEN@F13WINDOWMANAGERBwBw in Uni_bom004.obj
Unresolved External TAKENOTIFY@F13WINDOWMANAGERlll in Uni_bom004.obj
Unresolved External ONCLOSEEVENTCANCELLED@F13WINDOWMANAGER in Uni_bom004.obj
Unresolved External SETOPENRELATED@F15RELATIONMANAGER in Uni_bom004.obj
Unresolved External SETOPENRELATED@F15RELATIONMANAGER in Uni_bom004.obj
Unresolved External SETOPENRELATED@F15RELATIONMANAGER in Uni_bom004.obj
.....

Any help will be appreciated

Is this a multi-dll solution?
If so, has the data/base DLL been re-compiled in Clarion 11?
Make sure there are not any old .LIB files for you data DLL that might be accidentally being used for linking the other DLLs.

Hi Rick
Yes it is multi-dll solution.
Thanks for the info. Much appreciated. I managed to compile