When i am starting my unity3d 2018.2.5 or launching visual studio from inside unity3d, i am getting XmlException error. also VS is not able to create project solution files.
System configuration:
Unity3d version: 2018.2.5f1 (Personal)
OS: Windows 7 Professional (64 bit)
Visual studio: Visual studio Community 2017 (15.8.1)
Error Message:
XmlException: ‘/’ is an unexpected token. The expected token is ‘;’. Line 1184, position 18.
System.Xml.XmlTextReaderImpl.Throw (System.Exception e) (at <7fd195060d8c41448694ab221d3b56ca>:0)
System.Xml.XmlTextReaderImpl.Throw (System.String res, System.String[ ] args) (at <7fd195060d8c41448694ab221d3b56ca>:0)
System.Xml.XmlTextReaderImpl.ThrowUnexpectedToken (System.String expectedToken1, System.String expectedToken2) (at <7fd195060d8c41448694ab221d3b56ca>:0)
System.Xml.XmlTextReaderImpl.ThrowUnexpectedToken (System.Int32 pos, System.String expectedToken1, System.String expectedToken2) (at <7fd195060d8c41448694ab221d3b56ca>:0)
System.Xml.XmlTextReaderImpl.ThrowUnexpectedToken (System.Int32 pos, System.String expectedToken) (at <7fd195060d8c41448694ab221d3b56ca>:0)
System.Xml.XmlTextReaderImpl.HandleEntityReference (System.Boolean isInAttributeValue, System.Xml.XmlTextReaderImpl+EntityExpandType expandType, System.Int32& charRefEndPos) (at <7fd195060d8c41448694ab221d3b56ca>:0)
System.Xml.XmlTextReaderImpl.ParseText (System.Int32& startPos, System.Int32& endPos, System.Int32& outOrChars) (at <7fd195060d8c41448694ab221d3b56ca>:0)
System.Xml.XmlTextReaderImpl.FinishPartialValue () (at <7fd195060d8c41448694ab221d3b56ca>:0)
System.Xml.XmlTextReaderImpl.get_Value () (at <7fd195060d8c41448694ab221d3b56ca>:0)
System.Xml.Linq.XContainer.ReadContentFrom (System.Xml.XmlReader r) (at <428ab70c13974bd0bcd1eeafc00ea3e2>:0)
System.Xml.Linq.XContainer.ReadContentFrom (System.Xml.XmlReader r, System.Xml.Linq.LoadOptions o) (at <428ab70c13974bd0bcd1eeafc00ea3e2>:0)
System.Xml.Linq.XDocument.Load (System.Xml.XmlReader reader, System.Xml.Linq.LoadOptions options) (at <428ab70c13974bd0bcd1eeafc00ea3e2>:0)
System.Xml.Linq.XDocument.Parse (System.String text, System.Xml.Linq.LoadOptions options) (at <428ab70c13974bd0bcd1eeafc00ea3e2>:0)
System.Xml.Linq.XDocument.Parse (System.String text) (at <428ab70c13974bd0bcd1eeafc00ea3e2>:0)
SyntaxTree.VisualStudio.Unity.Bridge.ProjectFilePostprocessor.OnGeneratedCSProject (System.String path, System.String content) (at <0c8aa54c0de84872a1277ad9be9fd511>:0)
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[ ] parameters, System.Globalization.CultureInfo culture) (at :0)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[ ] parameters, System.Globalization.CultureInfo culture) (at :0)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[ ] parameters) (at :0)
UnityEditor.AssetPostprocessingInternal.CallOnGeneratedCSProject (System.String path, System.String content) (at C:/buildslave/unity/build/Editor/Mono/AssetPostprocessor.cs:178)
UnityEditor.VisualStudioIntegration.SolutionSynchronizer.SyncProjectFileIfNotChanged (System.String path, System.String newContents) (at C:/buildslave/unity/build/Editor/Mono/VisualStudioIntegration/SolutionSynchronizer.cs:315)
UnityEditor.VisualStudioIntegration.SolutionSynchronizer.SyncProject (UnityEditor.Scripting.MonoIsland island, System.Collections.Generic.Dictionary2[TKey,TValue] allAssetsProjectParts, UnityEditor.Scripting.Compilers.ScriptCompilerBase+ResponseFileData responseFileData, System.Collections.Generic.List1[T] allProjectIslands) (at C:/buildslave/unity/build/Editor/Mono/VisualStudioIntegration/SolutionSynchronizer.cs:308)
UnityEditor.VisualStudioIntegration.SolutionSynchronizer.GenerateAndWriteSolutionAndProjects (UnityEditorInternal.ScriptEditorUtility+ScriptEditor scriptEditor) (at C:/buildslave/unity/build/Editor/Mono/VisualStudioIntegration/SolutionSynchronizer.cs:240)
UnityEditor.VisualStudioIntegration.SolutionSynchronizer.Sync () (at C:/buildslave/unity/build/Editor/Mono/VisualStudioIntegration/SolutionSynchronizer.cs:212)
UnityEditor.SyncVS.SyncSolution () (at C:/buildslave/unity/build/Editor/Mono/SyncProject.cs:190)
UnityEditor.SyncVS.SyncAndOpenSolution () (at C:/buildslave/unity/build/Editor/Mono/SyncProject.cs:181)