error handling - The "XamlCTask" task failed unexpectedly on visual studio for xamarin -

when trying run application on xamarin on visual studio, getting error mentioned below , not able run application on device or emulator:

the "xamlctask" task failed unexpectedly. microsoft.cci.pdb.pdbdebugexception: unknown custom metadata item kind: 6    @ microsoft.cci.pdb.pdbfunction.readcustommetadata(bitaccess bits)    @ microsoft.cci.pdb.pdbfunction..ctor(manprocsym proc, bitaccess bits)    @ microsoft.cci.pdb.pdbfunction.loadmanagedfunctions(bitaccess bits, uint32 limit, boolean readstrings)    @ microsoft.cci.pdb.pdbfile.loadfuncsfromdbimodule(bitaccess bits, dbimoduleinfo info, inthashtable names, arraylist funclist, boolean readstrings, msfdirectory dir, dictionary`2 nameindex, pdbreader reader)    @ microsoft.cci.pdb.pdbfile.loadfunctions(stream read, dictionary`2& tokentosourcemapping, string& sourceserverdata)    @ mono.cecil.pdb.pdbreader.populatefunctions()    @ mono.cecil.pdb.pdbreader.processdebugheader(imagedebugdirectory directory, byte[] header)    @ mono.cecil.moduledefinition.processdebugheader()    @ mono.cecil.moduledefinition.readsymbols(isymbolreader reader)    @ mono.cecil.modulereader.readsymbols(moduledefinition module, readerparameters parameters)    @ mono.cecil.modulereader.createmodulefrom(image image, readerparameters parameters)    @ mono.cecil.moduledefinition.readmodule(stream stream, readerparameters parameters)    @ mono.cecil.moduledefinition.readmodule(string filename, readerparameters parameters)    @ xamarin.forms.build.tasks.xamlctask.compile()    @ xamarin.forms.build.tasks.xamlctask.execute()    @ microsoft.build.backend.taskexecutionhost.microsoft.build.backend.itaskexecutionhost.execute()    @ microsoft.build.backend.taskbuilder.<executeinstantiatedtask>d__1.movenext()  myfirstproject       

before adding "xamarin.forms.maps" nuget package, application working have added application stops running , getting error.

anybody me causes type of issue?

this issue arise, if xamarin.form version not compatible/matching nuget package have installed.

so, have updated xamarin.forms both xx.droid , pcl , make match dependencies nuget package.

now working fine. hope work you.