Can't run macro but can run the code inside the macro in root prompt

I can run the code inside the macro but I can’t run the macro.
(Thank you for your help)
I am getting an error message:
error: unknown type name ‘Jet’
Jet jet = (Jet) branchJet->At(0); //only take leading jet

Here is my macro code:

#include "/home/bmondal/Delphes-3.4.1/external/ExRootAnalysis/ExRootTreeReader.h"
#include "/home/bmondal/root/include/TROOT.h"
void trim(){

	TChain chain("Delphes");

	ExRootTreeReader *treeReader = new ExRootTreeReader(&chain);
	Long64_t numberOfEntries = treeReader->GetEntries();
	TClonesArray *branchJet = treeReader->UseBranch("FatJet");

	//Follow exroottree reader example
	//Here is one code i have used for analysis
	for(Int_t entry = 0; entry<numberOfEntries; ++entry){
	        if(branchJet->GetEntries()>0) {
	        	Jet *jet = (Jet*) branchJet->At(0); //only take leading jet
	            for(int i = 0; i<5; i++){
	                for(int j = 0; j<4; j++){


ROOT Version: 6.12
Platform: Ubuntu 18.04
Compiler: Not Provided

I am not sure, but I think you are missing includes with declaration of Jet class (most luckily #include "classes/DelphesClasses.h")

Thank you so much. At least the error message of not finding jet is gone.
Now this error message is showing

You are probably missing the definition of ExRootTreeReader::ReadEntry(long long)
Maybe you need to load the corresponding shared library?

I dont find any file lke “”. Then which shared library i should use?
Thank you for your help

I got it.
I separately downloaded it and make it.

Thank you

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