diff --git a/Project.toml b/Project.toml
index 42e505df..de922ccd 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "ExtendableGrids"
 uuid = "cfc395e8-590f-11e8-1f13-43a2532b2fa8"
-authors = ["Juergen Fuhrmann <juergen.fuhrmann@wias-berlin.de>", "Christian Merdon  <christian.merdon@wias-berlin.de>", "Johannes Taraz  <johannes.taraz@gmail.com>", "Patrick Jaap <patrick.jaap@wias-berlin.de>"]
 version = "1.14.2"
+authors = ["Juergen Fuhrmann <juergen.fuhrmann@wias-berlin.de>", "Christian Merdon  <christian.merdon@wias-berlin.de>", "Johannes Taraz  <johannes.taraz@gmail.com>", "Patrick Jaap <patrick.jaap@wias-berlin.de>"]
 
 [deps]
 AbstractTrees = "1520ce14-60c1-5f80-bbc7-55ef81b5835c"
@@ -10,6 +10,7 @@ Compat = "34da2185-b29b-5c13-b0c7-acf172513d20"
 Dates = "ade2ca70-3891-5945-98fb-dc099432e06a"
 DocStringExtensions = "ffbed154-4ef7-542d-bbb7-c09d3a79fcae"
 ElasticArrays = "fdbdab4c-e67f-52f5-8c3f-e7b388dad3d4"
+ExtensionErrors = "b7d44a4a-b691-4b61-aae1-e3eded184641"
 Graphs = "86223c79-3864-5bf0-83f7-82e725a168b6"
 InteractiveUtils = "b77e0a4c-d291-57a0-90e8-8db25a27a240"
 LinearAlgebra = "37e2e46d-f89d-539d-b4ee-838fcccc9c8e"
@@ -27,6 +28,9 @@ Metis = "2679e427-3c69-5b7f-982b-ece356f1e94b"
 TetGen = "c5d3f3f7-f850-59f6-8a2e-ffc6dc1317ea"
 Triangulate = "f7e6ffb2-c36d-4f8f-a77e-16e897189344"
 
+[sources]
+ExtensionErrors = {rev = "main", url = "https://github.com/jpthiele/ExtensionErrors.jl.git"}
+
 [extensions]
 ExtendableGridsGmshExt = "Gmsh"
 ExtendableGridsMetisExt = "Metis"
@@ -40,6 +44,7 @@ Compat = "4.10"
 Dates = "1.9"
 DocStringExtensions = "0.8,0.9"
 ElasticArrays = "1"
+ExtensionErrors = "1.0.0"
 Gmsh = "0.2.2,0.3"
 Graphs = "1.11.1"
 InteractiveUtils = "1.9"
diff --git a/src/io.jl b/src/io.jl
index 553aa026..b9bc2c5e 100644
--- a/src/io.jl
+++ b/src/io.jl
@@ -1,5 +1,5 @@
 using WriteVTK
-
+using ExtensionErrors
 # conversion from AbstractElementGeometry to WriteVTK.VTKCellTypes
 WriteVTK.VTKCellType(::Type{<:AbstractElementGeometry1D}) = VTKCellTypes.VTK_LINE
 WriteVTK.VTKCellType(::Type{<:Triangle2D}) = VTKCellTypes.VTK_TRIANGLE
@@ -162,19 +162,11 @@ function simplexgrid(file::String; format = "", kwargs...)
 end
 
 function simplexgrid(file::String, ::Type{Val{:msh}}; kwargs...)
-    return try
-        simplexgrid_from_gmsh(file)
-    catch e
-        throw(ErrorException("Missing Gmsh extension. Add Gmsh.jl to your environment and import it to read msh files."))
-    end
+    return simplexgrid_from_gmsh(file)
 end
 
 function simplexgrid(file::String, ::Type{Val{:geo}}; kwargs...)
-    return try
-        simplexgrid_from_gmsh(file)
-    catch e
-        throw(ErrorException("Missing Gmsh extension. Add Gmsh.jl to your environment and import it to read geo files."))
-    end
+    return simplexgrid_from_gmsh(file)
 end
 
 function simplexgrid(file::String, ::Type{Val{:sg}}; kwargs...)
@@ -272,10 +264,10 @@ function simplexgrid(file::String, ::Type{Val{:sg}}; kwargs...)
     return g
 end
 
-function simplexgrid_from_gmsh end
+@extensionfunction simplexgrid_from_gmsh(filename;incomplete=false,Tc = Float32,Ti=Int32) Gmsh
 
 function simplexgrid_to_gmsh end
 
-function mixedgrid_from_gmsh end
+@extensionfunction mixedgrid_from_gmsh(filename;Tc = Float32, Ti = Int32) Gmsh
 
 function mixedgrid_to_gmsh end