Reference to System.dll is declared but not found - how to solve? - asp.net

I'm trying so solve a Warning in an old asp.net Webapplication.
The warning Shows:
The Reference of Type System.Collections.Generic.ISet´1 is declared in "c:\Windows\assembly\GAC_MSIL\System\2.0.0.0__b77a5c561934e089\System.dll" , but couldn't found
Data: System.Core.dll
All the Files are in the folders. I dont know what it means and how I should solve that warning. Anybody got a clue?

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How can I solve this error "Fatal error: Cannot redeclare retrieve_password()"

I'm getting a error message when accessing 'wp-login.php' page and do not know how to fix it:
Fatal error: Cannot redeclare retrieve_password() (previously declared in E:\Inetpub\vhosts\winningbizzness.com\httpdocs\wp-login.php:311) in E:\Inetpub\vhosts\winningbizzness.com\httpdocs\wp-includes\user.php on line 2671
I had the same issue here and it was caused by a WordPress update failure where some files were missing or corrupted.
I quickly resolved just reinstalling WordPress. In my case I used FTP, as in this guide: https://kinsta.com/blog/reinstall-wordpress/
Hope it helps anyone reading this answer!

how do i get the solution for following error

Could not resolve this reference. Could not locate the assembly System.Web.Entity. Check to make sure the assembly exists on disk. If this reference is required by code, you may get compilation errors."
I got this error when suddenly started visual studio from WindowsOS to mac OS.
Is there any solution, anyone knows for this error?
Simple fix: Use the NuGet package System.Web.Http.Common instead of System.Web.Entity

Compilation Error on my server on SmartStore App

I have installed SmartStore on my server. everything is working fine except the add category module. when ever I try to Add or Edit any category an error pops saying :
Compilation Error Description: An error occurred during the
compilation of a resource required to service this request. Please
review the following specific error details and modify your source
code appropriately.
Compiler Error Message: CS0121: The call is ambiguous between the
following methods or properties:
'Telerik.Web.Mvc.UI.Fluent.GridToolBarCommandFactory.Template(System.Action>)'
and
'Telerik.Web.Mvc.UI.Fluent.GridToolBarCommandFactory.Template(System.Func,object>)'
Line 441: .ToolBar(commands => commands.Template(CategoryProductsGridCommands))
Please help me out. I m stuck :(
After working on it, we got the solution for this. So kindly try like this.
Hope will work
.ToolBar(commands => commands.Template(pp=>GridCommands(pp)))

NetBeans IDE 8.0.1 gives Redefinition failed with error 62 Check JVMTI documentation for this error code

I am using NetBeans IDE 8.0.1,jdk1.7.0_67,tomcat apache-tomcat-7.0.47. I have written a sample HelloWorld Spring MVC application and trying to profile the application. when i profile the application i get the following error
Redefinition failed with error 62
Check JVMTI documentation for this error code.
I have gone through the following links
https://netbeans.org/bugzilla/show_bug.cgi?id=191297
https://netbeans.org/bugzilla/show_bug.cgi?id=59085
As said in the links i have set the property "-Xverify:none" in netbeans.conf. After setting the property i get the same error.
This is the default options present in netbeans.conf
netbeans_default_options="-J-client -J-Xss2m -J-Xms32m -J-XX:PermSize=32m -J-Dapple.laf.useScreenMenuBar=true -J-Dapple.awt.graphics.UseQuartz=true -J-Dsun.java2d.noddraw=true -J-Dsun.java2d.dpiaware=true -J-Dsun.zip.disableMemoryMapping=true -J-Xverify:none"
Can some one please help me. Thanks in advance

Server Error in '/IIS' Application

Compilation Error
Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.
Compiler Error Message: CS0246: The type or namespace name 'PropertiesLayer' could not be found (are you missing a using directive or an assembly reference?)
Looks like your code could not findout "PropertiesLayer" which you are refering in your code.
Where is PropertiesLayer defined ? Is it a seperate assembly ? Did you add a reference to that ? If not, add that. That would fix your problem.
Also make sure you are really using something inside that namespace, If you are not using,just remove the import /using statement. I have seen code where namespaces are refereed and not being used.

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