When i install it i get this error
using 1.1 tekkit
Found mod Shaders
Starting installation
Creating backup
Unpacking JAR
==== Installing Shaders ====
Optifine detected.
==== Shaders Successfully Installed ====
Repacking JAR
Fatal error!
java.io.FileNotFoundException: C:\Users\philip\AppData\Roaming\.techniclauncher\tekkit\bin\modpack.jar (The process cannot access the file because it is being used by another process)
at java.io.FileOutputStream.open(Native Method)
at java.io.FileOutputStream.<init>(Unknown Source)
at java.io.FileOutputStream.<init>(Unknown Source)
at daxnitro.nitrous.FileUtility.packJar(FileUtility.java:29)
at daxnitro.nitrous.InstallThread.repackJAR(InstallThread.java:163)
at daxnitro.nitrous.InstallThread.run(InstallThread.java:46)