我遇到了这个错误，我在试图解决它时迷失了方法：
ld: warning: directory not found for option '-F/Users/user/Desktop/IntegratingFacebookTutorial-master/../../../Documents/FacebookSDK'
Undefined symbols for architecture i386:
"_FBTokenInformationExpirationDateKey", referenced from:
-[PFFacebookTokenCachingStrategy cacheTokenInformation:] in Parse(PFFacebookTokenCachingStrategy.o)
-[PFFacebookTokenCachingStrategy expirationDate] in Parse(PFFacebookTokenCachingStrategy.o)
-[PFFacebookTokenCachingStrategy setExpirationDate:] in Parse(PFFacebookTokenCachingStrategy.o)
"_FBTokenInformationTokenKey", referenced from:
-[PFFacebookTokenCachingStrategy accessToken] in Parse(PFFacebookTokenCachingStrategy.o)
-[PFFacebookTokenCachingStrategy setAccessToken:] in Parse(PFFacebookTokenCachingStrategy.o)
"_FBTokenInformationUserFBIDKey", referenced from:
-[PFFacebookTokenCachingStrategy facebookId] in Parse(PFFacebookTokenCachingStrategy.o)
-[PFFacebookTokenCachingStrategy setFacebookId:] in Parse(PFFacebookTokenCachingStrategy.o)
"_OBJC_CLASS_$_FBRequest", referenced from:
objc-class-ref in UserDetailsViewController.o
objc-class-ref in Parse(PFFacebookAuthenticationProvider.o)
"_OBJC_CLASS_$_FBSession", referenced from:
objc-class-ref in AppDelegate.o
objc-class-ref in Parse(PFFacebookAuthenticationProvider.o)
"_OBJC_CLASS_$_FBSessionTokenCachingStrategy", referenced from:
_OBJC_CLASS_$_PFFacebookTokenCachingStrategy in Parse(PFFacebookTokenCachingStrategy.o)
"_OBJC_METACLASS_$_FBSessionTokenCachingStrategy", referenced from:
_OBJC_METACLASS_$_PFFacebookTokenCachingStrategy in Parse(PFFacebookTokenCachingStrategy.o)
"_htmlParseDoc", referenced from:
-[CXHTMLDocument initWithXHTMLString:options:error:] in CXHTMLDocument.o
"_htmlReadMemory", referenced from:
-[CXHTMLDocument initWithXHTMLData:encoding:options:error:] in CXHTMLDocument.o
"_xmlAddChild", referenced from:
-[CXMLDocument(CXMLDocument_CreationExtensions) addChild:] in CXMLDocument_CreationExtensions.o
-[CXMLElement(CXMLElement_CreationExtensions) addChild:] in CXMLElement_CreationExtensions.o
-[CXMLElement(CXMLElement_CreationExtensions) setStringValue:] in CXMLElement_CreationExtensions.o
"_xmlAddPrevSibling", referenced from:
-[CXMLDocument(CXMLDocument_CreationExtensions) insertChild:atIndex:] in CXMLDocument_CreationExtensions.o
"_xmlCopyNode", referenced from:
-[CXMLNode copyWithZone:] in CXMLNode.o
"_xmlDocDumpFormatMemory", referenced from:
-[CXMLDocument description] in CXMLDocument.o
"_xmlDocDumpMemory", referenced from:
-[CXMLDocument XMLDataWithOptions:] in CXMLDocument.o
"_xmlDocGetRootElement", referenced from:
-[CXMLDocument initWithData:encoding:options:error:] in CXMLDocument.o
-[CXMLDocument rootElement] in CXMLDocument.o
"_xmlDocSetRootElement", referenced from:
+[CXMLNode(CXMLNode_CreationExtensions) documentWithRootElement:] in CXMLNode_CreationExtensions.o
-[CXHTMLDocument initWithXHTMLString:options:error:] in CXHTMLDocument.o
"_xmlFree", referenced from:
-[CXMLDocument XMLDataWithOptions:] in CXMLDocument.o
-[CXMLDocument description] in CXMLDocument.o
"_xmlFreeDoc", referenced from:
-[CXMLDocument dealloc] in CXMLDocument.o
"_xmlFreeNode", referenced from:
-[CXMLNode(CXMLNode_PrivateExtensions) invalidate] in CXMLNode_PrivateExtensions.o
"_xmlGetCharEncodingName", referenced from:
-[CXHTMLDocument initWithXHTMLString:options:error:] in CXHTMLDocument.o
"_xmlGetLastError", referenced from:
-[CXHTMLDocument initWithXHTMLString:options:error:] in CXHTMLDocument.o
-[CXMLDocument initWithXMLString:options:error:] in CXMLDocument.o
-[CXMLDocument initWithData:encoding:options:error:] in CXMLDocument.o
"_xmlNewDoc", referenced from:
+[CXMLNode(CXMLNode_CreationExtensions) document] in CXMLNode_CreationExtensions.o
+[CXMLNode(CXMLNode_CreationExtensions) documentWithRootElement:] in CXMLNode_CreationExtensions.o
"_xmlNewNode", referenced from:
+[CXMLNode(CXMLNode_CreationExtensions) elementWithName:] in CXMLNode_CreationExtensions.o
+[CXMLNode(CXMLNode_CreationExtensions) elementWithName:URI:] in CXMLNode_CreationExtensions.o
+[CXMLNode(CXMLNode_CreationExtensions) elementWithName:stringValue:] in CXMLNode_CreationExtensions.o
"_xmlNewNs", referenced from:
+[CXMLNode(CXMLNode_CreationExtensions) elementWithName:URI:] in CXMLNode_CreationExtensions.o
"_xmlNewPI", referenced from:
+[CXMLNode(CXMLNode_CreationExtensions) processingInstructionWithName:stringValue:] in CXMLNode_CreationExtensions.o
"_xmlNewText", referenced from:
-[CXMLElement(CXMLElement_CreationExtensions) setStringValue:] in CXMLElement_CreationExtensions.o
"_xmlNodeDumpOutput", referenced from:
-[CXMLNode XMLStringWithOptions:] in CXMLNode.o
"_xmlNodeSetContent", referenced from:
-[CXMLNode(CXMLNode_CreationExtensions) setStringValue:] in CXMLNode_CreationExtensions.o
"_xmlOutputBufferClose", referenced from:
-[CXMLNode XMLStringWithOptions:] in CXMLNode.o
"_xmlOutputBufferCreateIO", referenced from:
-[CXMLNode XMLStringWithOptions:] in CXMLNode.o
"_xmlOutputBufferFlush", referenced from:
-[CXMLNode XMLStringWithOptions:] in CXMLNode.o
"_xmlParseDoc", referenced from:
-[CXMLDocument initWithXMLString:options:error:] in CXMLDocument.o
"_xmlReadMemory", referenced from:
-[CXMLDocument initWithData:encoding:options:error:] in CXMLDocument.o
"_xmlResetLastError", referenced from:
-[CXHTMLDocument initWithXHTMLString:options:error:] in CXHTMLDocument.o
-[CXMLDocument initWithXMLString:options:error:] in CXMLDocument.o
-[CXMLDocument initWithData:encoding:options:error:] in CXMLDocument.o
"_xmlSetNs", referenced from:
-[CXMLElement(CXMLElement_CreationExtensions) addNamespace:] in CXMLElement_CreationExtensions.o
"_xmlStrcmp", referenced from:
-[CXMLElement elementsForName:] in CXMLElement.o
-[CXMLElement elementsForLocalName:URI:] in CXMLElement.o
-[CXMLElement attributeForName:] in CXMLElement.o
-[CXMLElement attributeForLocalName:URI:] in CXMLElement.o
-[CXMLElement namespaceForPrefix:] in CXMLElement.o
-[CXMLElement resolvePrefixForNamespaceURI:] in CXMLElement.o
"_xmlUnlinkNode", referenced from:
-[CXMLDocument dealloc] in CXMLDocument.o
-[CXMLNode(CXMLNode_PrivateExtensions) invalidate] in CXMLNode_PrivateExtensions.o
"_xmlXPathEvalExpression", referenced from:
-[CXHTMLDocument initWithXHTMLString:options:error:] in CXHTMLDocument.o
-[CXMLNode nodesForXPath:error:] in CXMLNode.o
-[CXMLNode(CXMLNode_NamespaceExtensions) nodesForXPath:namespaceMappings:error:] in CXMLNode_XPathExtensions.o
"_xmlXPathFreeContext", referenced from:
-[CXHTMLDocument initWithXHTMLString:options:error:] in CXHTMLDocument.o
-[CXMLNode nodesForXPath:error:] in CXMLNode.o
-[CXMLNode(CXMLNode_NamespaceExtensions) nodesForXPath:namespaceMappings:error:] in CXMLNode_XPathExtensions.o
"_xmlXPathFreeObject", referenced from:
-[CXHTMLDocument initWithXHTMLString:options:error:] in CXHTMLDocument.o
-[CXMLNode nodesForXPath:error:] in CXMLNode.o
-[CXMLNode(CXMLNode_NamespaceExtensions) nodesForXPath:namespaceMappings:error:] in CXMLNode_XPathExtensions.o
"_xmlXPathNewContext", referenced from:
-[CXHTMLDocument initWithXHTMLString:options:error:] in CXHTMLDocument.o
-[CXMLNode nodesForXPath:error:] in CXMLNode.o
-[CXMLNode(CXMLNode_NamespaceExtensions) nodesForXPath:namespaceMappings:error:] in CXMLNode_XPathExtensions.o
"_xmlXPathRegisterNs", referenced from:
-[CXMLNode(CXMLNode_NamespaceExtensions) nodesForXPath:namespaceMappings:error:] in CXMLNode_XPathExtensions.o
ld: symbol(s) not found for architecture i386
clang: error: linker command failed with exit code 1 (use -v to see invocation)