This issue has been already 
fixed 
https://github.com/web2py/pydal/commit/2172b776b9c41884717902e68900b41c105e0364#diff-114ce07f361177e0669ec9a374ef7d6a
Have you updated web2py  (and pydal) properly? 

Paolo
On Monday, May 25, 2015 at 7:37:35 AM UTC+2, Mark Graves wrote:
>
> I seem to be having the same problem. 
>
> On Sunday, May 24, 2015 at 6:58:26 PM UTC-5, villas wrote:
>>
>> Hi All,
>>
>> Can someone see what the problem is please?
>>
>> db.define_table('tag', Field('name'))    
>> db.define_table('test',Field('name'),Field('tags','list:reference tag'))
>>
>> def test():    
>>     grid = SQLFORM.grid(db.test, user_signature = False)
>>     return dict(grid=grid)
>>
>> Navigate to function test,  try using the grid. Save a record etc and view 
>> it.....
>>
>> Traceback (most recent call last):
>>   File "C:\Users\David\Documents\GitHub\web2py\gluon\restricted.py", line 
>> 227, in restricted
>>     exec ccode in environment
>>   File 
>> "C:/Users/David/Documents/GitHub/web2py/applications/owners/controllers/default.py"
>>  <http://localhost:8000/admin/default/edit/owners/controllers/default.py>, 
>> line 181, in <module>
>>   File "C:\Users\David\Documents\GitHub\web2py\gluon\globals.py", line 403, 
>> in <lambda>
>>     self._caller = lambda f: f()
>>   File 
>> "C:/Users/David/Documents/GitHub/web2py/applications/owners/controllers/default.py"
>>  <http://localhost:8000/admin/default/edit/owners/controllers/default.py>, 
>> line 139, in test
>>     grid = SQLFORM.grid(db.test, fields=[db.test.id,db.test.name], 
>> user_signature = False)
>>   File "C:\Users\David\Documents\GitHub\web2py\gluon\sqlhtml.py", line 2252, 
>> in grid
>>     view_form = SQLFORM(table, record, **sqlformargs)
>>   File "C:\Users\David\Documents\GitHub\web2py\gluon\sqlhtml.py", line 1203, 
>> in __init__
>>     inp = represent(field, default, record)
>>   File "C:\Users\David\Documents\GitHub\web2py\gluon\sqlhtml.py", line 68, 
>> in represent
>>     return f(value)
>>   File 
>> "C:\Users\David\Documents\GitHub\web2py\gluon\packages\dal\pydal\helpers\methods.py",
>>  line 268, in __call__
>>     if isinstance(db._adapter, GoogleDatastoreAdapter):
>> TypeError: isinstance() arg 2 must be a class, type, or tuple of classes and 
>> types
>>
>>

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