I cannot run my simulation program using omnet++ in Windows 7 - omnet++

Question

I am learning omnet++ to simulate a network. The code in packeage.ned is shown as follows:
package helloworld.simulations;
import inet.networklayer.configurator.ipv4.FlatNetworkConfigurator;
import inet.node.inet.Router;
import inet.node.inet.StandardHost;
#license(LGPL);
network Network
{
#display("bgb=519,314");
submodules:
Client: StandardHost {
#display("p=82,217");
}
router: Router {
#display("p=218,117");
}
Server: StandardHost {
#display("p=361,198");
}
flatNetworkConfigurator: FlatNetworkConfigurator {
#display("p=296,46;b=45,44");
}
connections:
Client.ethg++ <--> router.ethg++;
router.ethg++ <--> Server.ethg++;
}
And the code in omnetpp.ini is shown as follows:
[General]
network = helloworld.simulations.Network
**.Client.numTcpApps = 1
**.Client.tcpApp[0].typename = "TCPBasicClientApp"
**.Client.tcpApp[0].connectAddress = "Server"
**.Client.tcpApp[0].connectPort = 80
**.Client.tcpApp[0].thinkTime = 0s
**.Client.tcpApp[0].idleInterval = 0s
**.Server.numTcpApps = 1
**.Server.tcpApp[0].typename = "TCPEchoApp"
**.Server.tcpApp[0].localPort = 80
**.ppp[*].queueType = "DropTailQueue"
**.ppp[*].queue.frameCapacity = 10
However, when I run this program, I encounter the following problem:enter image description here
Now, I do not how to solve this problem. Thank you for your help!

Answer 1

Have you built INET? If yes, go to the mingw console and type:
opp_run -h nedfunctions -l /d/omnetpp-5.1.1/Projects/inet/src/inet | grep firstAvailableOrEmpty
After -l there is a path to your libINET.dll file. You should see something like:
firstAvailableOrEmpty : string firstAvailableOrEmpty(...)
Accepts any number of strings, interprets them as NED type names (qualified or unqualified), and returns the first one that exists and
its C++ implementation class is also available. Returns empty string
if none of the types are available.
Moreover, the instance of FlatNetworkConfigurator must be called configurator, not flatNetworkConfigurator.
EDIT
Go to INET properties then select OMNeT++ | Makemake | select src | Options... | Compile tab | More >> and ensure that you have set Export include path for other projects and Force compiling object files for use in DLLs. And in Target tab set Export this shared/static library for other projects. Then rebuild INET.
Then in your project:
In Properties | Project References make sure that inet is selected.
In Properties | OMNeT++ | Makemake | select directory with source files | Options... | Compile and make sure that the following options are checked:
Add include paths exported from referenced projects
Add include dir and other compile options from enabled project features
In Properties | OMNeT++ | Makemake | select directory with source files | Options... | Link and make sure that the following options are checked:
Link with libraries exported from referenced projects
Add libraries and other linker options from enabled project features
Rebuild your project.