spiredoc合并过程中出现的问题，如何解决
class com.spire.doc.packages.sprctB: An element with the same key already exists in the dictionary.
com.spire.ms.System.Collections.Generic.Dictionary.addItem(Dictionary.java:413)
com.spire.doc.VariableCollection.add(Unknown Source)
com.spire.doc.packages.sprPxc.spr (Unknown Source)
com.spire.doc.packages.sprLXc.spr (Unknown Source)
com.spire.doc.Document.spr (Unknown Source)
com.spire.doc.Document.spr (Unknown Source)
com.spire.doc.Document.loadFromFile(Unknown Source)
com.spire.doc.Document.loadFromFile(Unknown Source)
com.spire.doc.Document.insertTextFromFile(Unknown Source)
com.primeton.knowledge.word.SpireDoc.appWord(SpireDoc.java:113)
com.primeton.knowledge.word.SpireDoc.main(SpireDoc.java:37)
at com.spire.ms.System.Collections.Generic.Dictionary.addItem(Dictionary.java:413)
at com.spire.doc.VariableCollection.add(Unknown Source)
at com.spire.doc.packages.sprPxc.spr (Unknown Source)
at com.spire.doc.packages.sprLXc.spr (Unknown Source)
at com.spire.doc.Document.spr (Unknown Source)
at com.spire.doc.Document.spr (Unknown Source)
at com.spire.doc.Document.loadFromFile(Unknown Source)
at com.spire.doc.Document.loadFromFile(Unknown Source)
at com.spire.doc.Document.insertTextFromFile(Unknown Source)
at com.primeton.knowledge.word.SpireDoc.appWord(SpireDoc.java:113)
at com.primeton.knowledge.word.SpireDoc.main(SpireDoc.java:37)
在合并Word文档时,Spire.Doc发现文档中存在重复的元素键值