diff --git a/pisi/install.py b/pisi/install.py
index 18e71630..f30a5f73 100644
--- a/pisi/install.py
+++ b/pisi/install.py
@@ -75,6 +75,7 @@ class Installer:
 
     def check_requirements(self):
         """check system requirements"""
+        
         #TODO: IS THERE ENOUGH SPACE?
         # what to do if / is split into /usr, /var, etc.
         pass
diff --git a/pisi/metadata.py b/pisi/metadata.py
index f5b4ca01..0502879a 100644
--- a/pisi/metadata.py
+++ b/pisi/metadata.py
@@ -49,7 +49,7 @@ class SourceInfo:
     def has_errors(self):
         if not self.name:
             return [ _("SourceInfo should have a Name") ]
-        return None
+        return []
 
 
 class PackageInfo(specfile.PackageInfo):
@@ -88,13 +88,15 @@ class PackageInfo(specfile.PackageInfo):
     def has_errors(self):
         # FIXME: there should be real error msgs
         # and comment the logic here please, it isn't very clear -gurer
-        ret = (specfile.PackageInfo.has_errors(self) == None)
-        ret = ret and self.distribution!=None
-        ret = ret and self.distributionRelease!=None
-        ret = ret and self.architecture!=None and self.installedSize!=None
-        if ret:
-            return None
-        return [ _("Some error in package metadata") ]
+        err = Checks()
+        err.join(specfile.PackageInfo.has_errors(self))
+        err.has_tag(self.version, 'Package', 'Version')
+        err.has_tag(self.release, 'Package', 'Release')
+        err.has_tag(self.distribution, 'Package', 'Distribution')
+        err.has_tag(self.distributionRelease, 'Package', 'DistributionRelease')
+        err.has_tag(self.architecture, 'Package', 'Architecture')
+        err.has_tag(self.installedSize, 'Package', 'InstalledSize')
+        return err.list
 
     def __str__(self):
         s = specfile.PackageInfo.__str__(self)
diff --git a/pisi/package.py b/pisi/package.py
index fac9a7f8..c6c4a33d 100644
--- a/pisi/package.py
+++ b/pisi/package.py
@@ -27,6 +27,7 @@ import pisi.archive as archive
 from pisi.uri import URI
 from pisi.metadata import MetaData
 from pisi.files import Files
+import pisi.util as util
 
 class Error(pisi.Error):
     pass
@@ -99,7 +100,9 @@ class Package:
 
         self.metadata = MetaData()
         self.metadata.read( join(outdir, ctx.const.metadata_xml) )
-        if self.metadata.has_errors():
+        errs = self.metadata.has_errors()
+        if errs:
+            util.Checks.print_errors(errs)
             raise Error, _("MetaData format wrong")
 
         self.files = Files()
diff --git a/pisi/specfile.py b/pisi/specfile.py
index 5eccf157..6e0179fd 100644
--- a/pisi/specfile.py
+++ b/pisi/specfile.py
@@ -123,7 +123,7 @@ class PatchInfo:
     def has_errors(self):
         if not self.filename:
             return [ _("Patch should have a filename string") ]
-        return None
+        return []
 
     def __str__(self):
         s = self.filename
@@ -187,7 +187,7 @@ class PathInfo:
     def has_errors(self):
         if not self.pathname:
             return [ _("Path tag should have a name string") ]
-        return None
+        return []
 
     def __str__(self):
         s = self.pathname
@@ -209,7 +209,7 @@ class ComarProvide:
     def has_errors(self):
         if not self.om or not self.script:
             return [ _("COMAR provide should have something :)") ]
-        return None
+        return []
 
     def __str__(self):
         s = self.script
diff --git a/pisi/util.py b/pisi/util.py
index 96a0b0b7..ac176737 100644
--- a/pisi/util.py
+++ b/pisi/util.py
@@ -46,25 +46,25 @@ class FileError(Error):
 
 class Checks:
     def __init__(self):
-        self.list = None
+        self.list = []
     
     def add(self, err):
-        if not self.list:
-            self.list = []
         self.list.append(err)
     
     def join(self, list):
-        if list != None:
-            if not self.list:
-                self.list = []
-            self.list.extend(list)
+        self.list.extend(list)
     
     def has_tag(self, var, section, name):
         if not var:
-            if not self.list:
-                self.list = []
             self.list.append(_("%s section should have a '%s' tag") % (section, name))
 
+    def has_error():
+        return len(self.list)>0
+        
+    def print_errors(list):
+        for x in list:
+            ctx.ui.error(x)
+    print_errors = staticmethod(print_errors)
 
 #########################
 # string/list functions #