WPF - My application installer is crashing

Its a .NET 3.5, x86 application that I built. It works. But when I try to install it using a custom installer, it fails with this error The App has stopped working. In the dialog box, it shows path to two files. In one of the files, I found this.

<ProblemSignatures>
    <EventType>CLR20r3</EventType>
    <Parameter0>app.installer.exe</Parameter0>
    <Parameter1>1.0.0.0</Parameter1>
    <Parameter2>5321e224</Parameter2>
    <Parameter3>App.Installer</Parameter3>
    <Parameter4>1.0.0.0</Parameter4>
    <Parameter5>5321e224</Parameter5>
    <Parameter6>4</Parameter6>
    <Parameter7>e</Parameter7>
    <Parameter8>System.IO.FileNotFoundException</Parameter8>
</ProblemSignatures>

Is there a way I can find what file was not found for Parameter8 above?

In the other file, I found this Exception Code: 0xe0434f4d but that didn't help much either.

Update: I'm installing by adding a separate project that is pointing to the .application file of the actual app like below.

try
{
    Uri deploymentUri = new Uri(deployManifestUriStr);
    iphm = new InPlaceHostingManager(deploymentUri, false);
}

It was missing a dll. I tried copying that dll to the folder where exe was being run from and it works. But I couldn't still figure out how to find the NAME of the missing file. I just found out it was missing a dll by trial and error. Unless I get a better answer, this is the answer, I guess. Make sure you have all dlls the exe is expecting in the exe directory.