I've only done a few deployments from Lansweeper, so someone more knowledgeable will probably think of something I don't, but here's a few places where I've gotten stuck:
The creds for the deployment have admin access?
The creds for the package share have read-execute access?
Lansweeper has the correct location for the package share?
Another thing that got me was with the installer creator, the help text says to use quotation marks if there are spaces in the parameters - I found this not to be the case, once I removed those quotation marks the deployment worked as expected.