Error report first launch

Object: FVM_InsertMesh (level 1)
{
Exception has been thrown by the target of an invocation.
TargetInvocationException
}

Object: FVM_InsertMesh (level 2)
{
Could not load file or assembly 'Pachyderm_Acoustic, Version=2.6.0.29, Culture=neutral, PublicKeyToken=null'. The system cannot find the file specified.
FileNotFoundException
}