Error Fody: No weavers found. Add the desired weavers via their nuget package

In my case, FodyWeavers.xml is already exists because the PropertyChanged.Fody library was installed. if this file exists, just add <Costura /> to it.

Before

<Weavers xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="FodyWeavers.xsd">
  <PropertyChanged />
</Weavers>

After

<Weavers xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="FodyWeavers.xsd">
  <PropertyChanged />
  <Costura />
</Weavers>

I had same issue on my Cake script using MSBuild command and I solved that:

a) Applying EgoistDeveloper above tip
b) Cleaning ./bin and ./obj folder of all projects under my solution folder
c) Adding -t:Clean,Restore,... msbuild parameter command line

Sometimes (for unknown reason) FodyWeavers.xml cannot be added automatically when the package is added. You'll need to add it to the root of the project manually:

<?xml version="1.0" encoding="utf-8"?>
<Weavers xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="FodyWeavers.xsd">
  <Costura />
</Weavers>

I'm using Fody 4.2.1 and Costura.Fody 3.3.3

I hope it helps 😊