Error while importing ESRI ArcGIS maps SDK

Unity Engine
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1

I am getting an error while importing maps from ArcGIS SDK for Unity. Can anyone help?

The error looks like this:

System.DllNotFoundException: libruntimecore.so assembly:<unknown assembly> type:<unknown type> member:(null)
  at (wrapper managed-to-native) Esri.GameEngine.PInvoke.RT_ArcGISRuntimeEnvironment_setRuntimeClient(Esri.Standard.ArcGISRuntimeClient,string,intptr)
  at Esri.GameEngine.ArcGISRuntimeEnvironment.SetRuntimeClient (Esri.Standard.ArcGISRuntimeClient runtimeClient, System.String version) [0x00006] in ./Packages/com.esri.arcgis-maps-sdk/SDK/API/GameEngine/ArcGISRuntimeEnvironment.cs:325 
  at Esri.Unity.Environment.Initialize (System.String productName, System.String productVersion, System.String tempDirectory, System.String installDirectory) [0x0002f] in ./Packages/com.esri.arcgis-maps-sdk/SDK/API/Unity/Environment.cs:52 
  at Esri.ArcGISMapsSDK.Utils.Environment.Initialize () [0x0002a] in ./Packages/com.esri.arcgis-maps-sdk/SDK/Utils/Environment.cs:85 
  at Esri.ArcGISMapsSDK.Utils.Environment..cctor () [0x00000] in ./Packages/com.esri.arcgis-maps-sdk/SDK/Utils/Environment.cs:42 
UnityEditor.EditorAssemblies:ProcessInitializeOnLoadAttributes (System.Type[]) (at /home/bokken/build/output/unity/unity/Editor/Mono/EditorAssemblies.cs:127)

and,

System.TypeInitializationException: The type initializer for 'Esri.ArcGISMapsSDK.Utils.Environment' threw an exception. ---> System.DllNotFoundException: libruntimecore.so assembly:<unknown assembly> type:<unknown type> member:(null)
  at (wrapper managed-to-native) Esri.GameEngine.PInvoke.RT_ArcGISRuntimeEnvironment_setRuntimeClient(Esri.Standard.ArcGISRuntimeClient,string,intptr)
  at Esri.GameEngine.ArcGISRuntimeEnvironment.SetRuntimeClient (Esri.Standard.ArcGISRuntimeClient runtimeClient, System.String version) [0x00006] in ./Packages/com.esri.arcgis-maps-sdk/SDK/API/GameEngine/ArcGISRuntimeEnvironment.cs:325 
  at Esri.Unity.Environment.Initialize (System.String productName, System.String productVersion, System.String tempDirectory, System.String installDirectory) [0x0002f] in ./Packages/com.esri.arcgis-maps-sdk/SDK/API/Unity/Environment.cs:52 
  at Esri.ArcGISMapsSDK.Utils.Environment.Initialize () [0x0002a] in ./Packages/com.esri.arcgis-maps-sdk/SDK/Utils/Environment.cs:85 
  at Esri.ArcGISMapsSDK.Utils.Environment..cctor () [0x00000] in ./Packages/com.esri.arcgis-maps-sdk/SDK/Utils/Environment.cs:42 
   --- End of inner exception stack trace ---
  at Esri.ArcGISMapsSDK.Editor.Utils.Environment..cctor () [0x00005] in ./Packages/com.esri.arcgis-maps-sdk/Editor/Utils/Environment.cs:27 
UnityEditor.EditorAssemblies:ProcessInitializeOnLoadAttributes (System.Type[]) (at /home/bokken/build/output/unity/unity/Editor/Mono/EditorAssemblies.cs:127)

Thanks in advance.