I am receiving the same error. See below... However in reference to the error if you look at where the download is being hosted. It was updated 3 hours ago, to folder lib files at https://github.com/ForgeEssentials/ForgeEssentialsMain/tree/master/lib it shows that one of the devs changed the checksum text to a value of 52314f3ac527c643444f529fe9ee00c25aa16d91, when the batch is stil expecting cea9f7f8e6bcb580d953a8651fb8391640de0f85. Till the mismatch is corrected no one will be able to open a new Tekklite server, less they are able to edit a .jar themselves.
2013-01-06 20:20:01 [sEVERE] [ForgeModLoader] There were errors during initial F
ML setup. Some files failed to download or were otherwise corrupted. You will ne
ed to manually obtain the following files from these download links and ensure y
our lib directory is clean.
2013-01-06 20:20:01 [sEVERE] [ForgeModLoader] *** Download http://files.minecraf
tforge.net/fmllibs/argo-2.25.jar
2013-01-06 20:20:01 [sEVERE] [ForgeModLoader] *** Download http://files.minecraf
tforge.net/fmllibs/guava-12.0.1.jar
2013-01-06 20:20:01 [sEVERE] [ForgeModLoader] *** Download http://files.minecraf
tforge.net/fmllibs/asm-all-4.0.jar
2013-01-06 20:20:01 [sEVERE] [ForgeModLoader] *** Download http://files.minecraf
tforge.net/fmllibs/bcprov-jdk15on-147.jar
2013-01-06 20:20:01 [sEVERE] [ForgeModLoader] *** Download https://github.com/Fo
rgeEssentials/ForgeEssentialsMain/raw/master/lib/mysql-connector-java-bin.jar
2013-01-06 20:20:01 [sEVERE] [ForgeModLoader] *** Download https://github.com/Fo
rgeEssentials/ForgeEssentialsMain/raw/master/lib/sqlite-jdbc.jar
2013-01-06 20:20:01 [sEVERE] [ForgeModLoader] *** Download https://github.com/Fo
rgeEssentials/ForgeEssentialsMain/raw/master/lib/worldedit-5.4.6-SNAPSHOT.jar
2013-01-06 20:20:01 [sEVERE] [ForgeModLoader] <===========>
2013-01-06 20:20:01 [sEVERE] [ForgeModLoader] The following is the errors that c
aused the setup to fail. They may help you diagnose and resolve the issue
2013-01-06 20:20:01 [sEVERE] [ForgeModLoader] The downloaded file sqlite-jdbc.ja
r has an invalid checksum 52314f3ac527c643444f529fe9ee00c25aa16d91 (expecting ce
a9f7f8e6bcb580d953a8651fb8391640de0f85). The download did not succeed correctly
and the file has been deleted. Please try launching again.
2013-01-06 20:20:01 [sEVERE] [ForgeModLoader] <<< ==== >>>
2013-01-06 20:20:01 [sEVERE] [ForgeModLoader] The following is diagnostic inform
ation for developers to review.
2013-01-06 20:20:01 [sEVERE] [ForgeModLoader] Error details
java.lang.RuntimeException: The downloaded file sqlite-jdbc.jar has an invalid c
hecksum 52314f3ac527c643444f529fe9ee00c25aa16d91 (expecting cea9f7f8e6bcb580d953
a8651fb8391640de0f85). The download did not succeed correctly and the file has b
een deleted. Please try launching again.