java - IPackageFragment not open when trying to get IPackageFragment with pacakge name -

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With the code given below, I am trying to get the IPCageFragment element for a given package name. But the toasting of the ipak fragment () is back com.abc.def (not open). When trying to access the methods of all sections in this package, I get the JavaModel exception.

Note: I can open and view Java files in this package in Eclipse. Let anyone know what is wrong with this package. 

  Receives private ipafefrazgrag package (name of string) throws an exception {ipafegraphragment root [] root = project.gatealepackagefragmentput (); (Int ii = 0; ii & lt; roots.length; ii ++) (Ipackage fragment piece = root [ii] .getPackageFragment (name); if (piece! = Null & piece. Axis) {Return slice;}} return tap;}    
 
 
 navigate to pieces of the package or Before reaching the elements in the package section, you must call open () on the package section.

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