diff --git a/pyerrors/input/dobs.py b/pyerrors/input/dobs.py
index 44c90a02..27e13997 100644
--- a/pyerrors/input/dobs.py
+++ b/pyerrors/input/dobs.py
@@ -61,9 +61,9 @@ def _dict_to_xmlstring(d):
             elif not d[k]:
                 return '\n'
             else:
-                raise TypeError('Type', type(d[k]), 'not supported in export!')
+                raise TypeError(f'Type {type(d[k]).__name__} not supported in export!')
     else:
-        raise TypeError('Type', type(d), 'not supported in export!')
+        raise TypeError(f'Type {type(d).__name__} not supported in export!')
     return iters
 
 
@@ -153,7 +153,7 @@ def create_pobs_string(obsl, name, spec='', origin='', symbol=None, enstag=None)
     if not isinstance(symbol, list):
         raise TypeError('Symbol has to be a list!')
     if not (len(symbol) == 0 or len(symbol) == len(obsl)):
-        raise ValueError(f'Symbol has to be a list of lenght 0 or {len(obsl)}!')
+        raise ValueError(f'Symbol has to be a list of length 0 or {len(obsl)}!')
     for s in symbol:
         osymbol += f' {s}'
     for r in range(nr):
@@ -365,7 +365,7 @@ def read_pobs(fname, full_output=False, gz=True, separator_insertion=None):
         elif isinstance(separator_insertion, str):
             name = name.replace(separator_insertion, f"|{separator_insertion}")
         else:
-            raise TypeError("separator_insertion has to be string or int, is ", type(separator_insertion))
+            raise TypeError(f"separator_insertion has to be string or int, is {type(separator_insertion).__name__}")
         names.append(name)
         idl.append(idx)
     res = [Obs([d[i] for d in deltas], names, idl=idl) for i in range(len(deltas[0]))]
@@ -485,7 +485,7 @@ def import_dobs_string(content, full_output=False, separator_insertion=True):
                 elif isinstance(separator_insertion, str):
                     rname = rname.replace(separator_insertion, f"|{separator_insertion}")
                 else:
-                    raise TypeError("separator_insertion has to be string or int, is ", type(separator_insertion))
+                    raise TypeError(f"separator_insertion has to be string or int, is {type(separator_insertion).__name__}")
                 if '|' in rname:
                     new_ename = rname[:rname.index('|')]
                 else:
@@ -657,9 +657,9 @@ def _dobsdict_to_xmlstring(d):
             elif not d[k]:
                 return '\n'
             else:
-                raise TypeError('Type', type(d[k]), 'not supported in export!')
+                raise TypeError(f'Type {type(d[k]).__name__} not supported in export!')
     else:
-        raise TypeError('Type', type(d), 'not supported in export!')
+        raise TypeError(f'Type {type(d).__name__} not supported in export!')
     return iters
 
 
@@ -754,7 +754,7 @@ def create_dobs_string(obsl, name, spec='dobs v1.0', origin='', symbol=None, who
         if not isinstance(symbol, list):
             raise TypeError('Symbol has to be a list!')
         if not (len(symbol) == 0 or len(symbol) == len(obsl)):
-            raise ValueError(f'Symbol has to be a list of lenght 0 or {len(obsl)}!')
+            raise ValueError(f'Symbol has to be a list of length 0 or {len(obsl)}!')
         osymbol = symbol[0]
         for s in symbol[1:]:
             osymbol += f' {s}'
diff --git a/pyerrors/input/openQCD.py b/pyerrors/input/openQCD.py
index 91d89a8c..6405a98f 100644
--- a/pyerrors/input/openQCD.py
+++ b/pyerrors/input/openQCD.py
@@ -1203,7 +1203,7 @@ def read_ms5_xsf(path, prefix, qc, corr, sep="r", **kwargs):
 
     # test if the input is correct
     if qc not in ['dd', 'ud', 'du', 'uu']:
-        raise ValueError("Unknown quark conbination!")
+        raise ValueError("Unknown quark combination!")
 
     if corr not in ["gS", "gP", "gA", "gV", "gVt", "lA", "lV", "lVt", "lT", "lTt", "g1", "l1"]:
         raise ValueError("Unknown correlator!")
diff --git a/pyerrors/input/sfcf.py b/pyerrors/input/sfcf.py
index c4989ebd..1b4478ab 100644
--- a/pyerrors/input/sfcf.py
+++ b/pyerrors/input/sfcf.py
@@ -208,7 +208,7 @@ def read_sfcf_multi(path, prefix, name_list, quarks_list=None, corr_type_list=No
         if len(new_names) != len(set(new_names)):
             raise ValueError("names are not unique!")
         if len(new_names) != replica:
-            raise ValueError('names should have the length', replica)
+            raise ValueError(f'names should have the length {replica}')
 
     else:
         ens_name = kwargs.get("ens_name")
diff --git a/pyerrors/mpm.py b/pyerrors/mpm.py
index 7d09980a..96dde32b 100644
--- a/pyerrors/mpm.py
+++ b/pyerrors/mpm.py
@@ -45,7 +45,7 @@ def matrix_pencil_method(corrs, k=1, p=None, **kwargs):
     if n_data <= p:
         raise ValueError('The pencil p has to be smaller than the number of data samples.')
     if p < k or n_data - p < k:
-        raise ValueError('Cannot extract', k, 'energy levels with p=', p, 'and N-p=', n_data - p)
+        raise ValueError(f'Cannot extract {k} energy levels with p={p} and N-p={n_data - p}')
 
     # Construct the hankel matrices
     matrix = []