Chakkaphan Tuntipanichphan

What is the mean of warning? how to solve it?
API 0.0 21 MB warn 302039: Z:ChakkaphanDocumentsRenderingnowtoday.mi, line 440: while defining object “topnurbsCubeShape1”: redefinition of object “topnurbsCubeShape1”
API 0.0 21 MB warn 302068: Z:ChakkaphanDocumentsRenderingnowtoday.mi, line 454: while defining texture “file6:tex”: redefinition of texture “file6:tex”
API 0.0 20 MB warn 302039: Z:ChakkaphanDocumentsRenderingnowtoday.mi, line 718: while defining object “leftnurbsCubeShape1”: redefinition of object “leftnurbsCubeShape1”
API 0.0 20 MB warn 302039: Z:ChakkaphanDocumentsRenderingnowtoday.mi, line 843: while defining object “rightnurbsCubeShape1”: redefinition of object “rightnurbsCubeShape1”
API 0.0 20 MB warn 302039: Z:ChakkaphanDocumentsRenderingnowtoday.mi, line 968: while defining object “backnurbsCubeShape1”: redefinition of object “backnurbsCubeShape1”
API 0.0 20 MB warn 302039: Z:ChakkaphanDocumentsRenderingnowtoday.mi, line 1093: while defining object “frontnurbsCubeShape1”: redefinition of object “frontnurbsCubeShape1”
API 0.0 20 MB warn 302068: Z:ChakkaphanDocumentsRenderingnowtoday.mi, line 1107: while defining texture “floor_blinnNew_file4:tex”: redefinition of texture “floor_blinnNew_file4:tex”
API 0.0 19 MB warn 302039: Z:ChakkaphanDocumentsRenderingnowtoday.mi, line 1382: while defining object “FloorShape”: redefinition of object “FloorShape”
API 0.0 19 MB warn 302039: Z:ChakkaphanDocumentsRenderingnowtoday.mi, line 1507: while defining object “frontnurbsCubeShape2”: redefinition of object “frontnurbsCubeShape2”
API 0.0 19 MB warn 302039: Z:ChakkaphanDocumentsRenderingnowtoday.mi, line 2503: while defining object “bowlShape”: redefinition of object “bowlShape”
API 0.0 19 MB warn 302039: Z:ChakkaphanDocumentsRenderingnowtoday.mi, line 4033: while defining object “banana2Shape”: redefinition of object “banana2Shape”
API 0.0 19 MB warn 302039: Z:ChakkaphanDocumentsRenderingnowtoday.mi, line 5391: while defining object “banana1Shape”: redefinition of object “banana1Shape”
API 0.0 18 MB warn 302039: Z:ChakkaphanDocumentsRenderingnowtoday.mi, line 6076: while defining object “appleBodyShape”: redefinition of object “appleBodyShape”
API 0.0 18 MB warn 302039: Z:ChakkaphanDocumentsRenderingnowtoday.mi, line 6384: while defining object “appleStemShape”: redefinition of object “appleStemShape”
API 0.0 18 MB warn 302068: Z:ChakkaphanDocumentsRenderingnowtoday.mi, line 6410: while defining texture “file1:tex”: redefinition of texture “file1:tex”
API 0.0 18 MB warn 302039: Z:ChakkaphanDocumentsRenderingnowtoday.mi, line 6762: while defining object “orangeShape”: redefinition of object “orangeShape”
API 0.0 18 MB warn 302025: Z:ChakkaphanDocumentsRenderingnowtoday.mi, line 6776: while defining instgroup “:MayaTranslatedWorld”: redefinition of group “:MayaTranslatedWorld”