diff --git a/src/AutGroup.jl b/src/AutGroup.jl
index b4d27b6..6c80552 100644
--- a/src/AutGroup.jl
+++ b/src/AutGroup.jl
@@ -331,7 +331,7 @@ inv(f::AutSymbol) = change_pow(f, -f.pow)
 
 function getperm(s::AutSymbol)
     if s.pow != 1
-        warn("Power for perm_symbol should be never 0!")
+        @warn("Power for perm_symbol should be never 0!")
         return s.fn.perm^s.pow
     else
         return s.fn.perm
diff --git a/src/FPGroups.jl b/src/FPGroups.jl
index 3a6cc15..545c87d 100644
--- a/src/FPGroups.jl
+++ b/src/FPGroups.jl
@@ -142,7 +142,7 @@ inv(s::FPSymbol) = change_pow(s, -s.pow)
 
 function reduce!(W::FPGroupElem)
     if length(W) < 2
-        deleteat!(W.symbols, find(x -> x.pow == 0, W.symbols))
+        deleteat!(W.symbols, findall(x -> x.pow == 0, W.symbols))
     else
         reduced = false
         while !reduced
diff --git a/src/Groups.jl b/src/Groups.jl
index dd29ce4..916cc04 100644
--- a/src/Groups.jl
+++ b/src/Groups.jl
@@ -1,4 +1,3 @@
-__precompile__()
 module Groups
 
 using AbstractAlgebra