I kept repeatedly getting this error:

Rebuilding Forked projects....
applyPatches.sh: 7: applyPatches.sh: function: not found
fatal: ambiguous argument '': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] – [<file>...]'
Resetting to ...
error: Could not remove config section 'remote.upstream'
fatal: ambiguous argument 'upstream/upstream': unknown revision or path not in the working tree.
Use '--' to separate paths from revisions, like this:
'git <command> [<revision>...] – [<file>...]'
Applying patches to ...
fatal: Resolve operation not in progress, we are not resuming.
fatal: could not open '/home/tejesh/btoolstesting/56/Spigot/-Patches/*.patch' for reading: No such file or directory
Something did not apply cleanly to .
Please review above details and finish the apply then
save the changes with rebuildPatches.sh
Error compiling Spigot. Please check the wiki for FAQs.
If this does not resolve your issue then please pastebin the entire BuildTools.log.txt file when seeking support.
java.lang.RuntimeException: Error running command, return status !=0: [sh, applyPatches.sh]
at org.spigotmc.builder.Builder.runProcess(Builder.java:547)
at org.spigotmc.builder.Builder.main(Builder.java:429)