The Eclipse LDT debugging environment depend on the luasocket library to provide communication between the IDE and the Lua VM. Unfortunately, Love embedded luasocket is somewhat outdated, causing a few errors in LDT's debugger.lua. For example, calling print("") will cause an unexpected table argument to function filter.chain in ltn12.lua.
Though it could be argued that debugger.lua should indeed works fine with older releases of luasocket and that there lies the root issue, it seems however probable that similar problems will happen with other external libraries that have dependencies on luasocket. More over, it seems desirable for love to upgrade to the latest release of that library.