[web2py] Error in GAE TypeError: ConjunctionNode()

I have an aplication deployed in GAE tha has been running for months with 
no problem, but in the last deployment in GAE, it has raised a new error:


TypeError: ConjunctionNode() expects Node instances as arguments; received 
a non-Node instance None

The error has to do with *IS_IN_DB* validator, and is has appeared in the 
last deployment (today). It worked fine until now.

This is the code: 

def index_gestor():
    titulares = db(db.auth_user.tipo_usuario=='Titular')
    form = SQLFORM.factory(
        Field('socio', db.auth_user, requires = 
IS_IN_DB(titulares,'auth_user.id','%(last_name)s'+', '+ '%(first_name)s'+' 
- '+ '%(f_numero_socio)s',sort=True)), 
        Field('consulta', type='string', requires = 
IS_IN_SET(['Familiares', 'Movimientos','Pedidos']),default='Familiares'),
        buttons=[TAG.button('CONSULTAR',_type="submit", _class="btn 
btn-warning btn-large")],
        table_name='seleccion_socios')
    if form.process().accepted:
        if form.vars.consulta == 'Familiares':
          
 
redirect(URL("gestor","familiares_socio_manage.html",args=[form.vars.socio],user_signature=True))
        elif form.vars.consulta == 'Movimientos':
          
 
redirect(URL("gestor","cuenta_socio_manage.html",args=[form.vars.socio],user_signature=True))
        elif form.vars.consulta == 'Pedidos':
          
 
redirect(URL("gestor_productos","pedidos_por_socio",args=[form.vars.socio],user_signature=True))
    
    return locals()

The problem is with the line  Field('socio', db.auth_user, requires = 
IS_IN_DB(titulares,'auth_user.id','%(last_name)s'+', '+ '%(first_name)s'+' 
- '+ '%(f_numero_socio)s',sort=True)), 

This is the ticket: 

Traceback (most recent call last): File 
"/base/data/home/apps/s~clubatletismosada/2.386403586504283664/gluon/restricted.py",
 
line 227 
<https://console.developers.google.com/project/clubatletismosada/clouddev/debug/resolve_location?appModule=default&appVersion=2&timestampNanos=1439465598003000000&file=%2Fbase%2Fdata%2Fhome%2Fapps%2Fs~clubatletismosada%2F2.386403586504283664%2Fgluon%2Frestricted.py&line=227>,
 
in restricted exec ccode in environment File 
"/base/data/home/apps/s~clubatletismosada/2.386403586504283664/applications/CAS/controllers/gestor.py",
 
line 400 
<https://console.developers.google.com/project/clubatletismosada/clouddev/debug/resolve_location?appModule=default&appVersion=2&timestampNanos=1439465598003000000&file=%2Fbase%2Fdata%2Fhome%2Fapps%2Fs~clubatletismosada%2F2.386403586504283664%2Fapplications%2FCAS%2Fcontrollers%2Fgestor.py&line=400>,
 
in <module> File 
"/base/data/home/apps/s~clubatletismosada/2.386403586504283664/gluon/globals.py",
 
line 412 
<https://console.developers.google.com/project/clubatletismosada/clouddev/debug/resolve_location?appModule=default&appVersion=2&timestampNanos=1439465598003000000&file=%2Fbase%2Fdata%2Fhome%2Fapps%2Fs~clubatletismosada%2F2.386403586504283664%2Fgluon%2Fglobals.py&line=412>,
 
in <lambda> self._caller = lambda f: f() File 
"/base/data/home/apps/s~clubatletismosada/2.386403586504283664/gluon/tools.py", 
line 3769 
<https://console.developers.google.com/project/clubatletismosada/clouddev/debug/resolve_location?appModule=default&appVersion=2&timestampNanos=1439465598003000000&file=%2Fbase%2Fdata%2Fhome%2Fapps%2Fs~clubatletismosada%2F2.386403586504283664%2Fgluon%2Ftools.py&line=3769>,
 
in f return action(*a, **b) File 
"/base/data/home/apps/s~clubatletismosada/2.386403586504283664/applications/CAS/controllers/gestor.py",
 
line 12 
<https://console.developers.google.com/project/clubatletismosada/clouddev/debug/resolve_location?appModule=default&appVersion=2&timestampNanos=1439465598003000000&file=%2Fbase%2Fdata%2Fhome%2Fapps%2Fs~clubatletismosada%2F2.386403586504283664%2Fapplications%2FCAS%2Fcontrollers%2Fgestor.py&line=12>,
 
in index_gestor table_name='seleccion_socios') File 
"/base/data/home/apps/s~clubatletismosada/2.386403586504283664/gluon/sqlhtml.py",
 
line 1771 
<https://console.developers.google.com/project/clubatletismosada/clouddev/debug/resolve_location?appModule=default&appVersion=2&timestampNanos=1439465598003000000&file=%2Fbase%2Fdata%2Fhome%2Fapps%2Fs~clubatletismosada%2F2.386403586504283664%2Fgluon%2Fsqlhtml.py&line=1771>,
 
in factory **attributes) File 
"/base/data/home/apps/s~clubatletismosada/2.386403586504283664/gluon/sqlhtml.py",
 
line 1259 
<https://console.developers.google.com/project/clubatletismosada/clouddev/debug/resolve_location?appModule=default&appVersion=2&timestampNanos=1439465598003000000&file=%2Fbase%2Fdata%2Fhome%2Fapps%2Fs~clubatletismosada%2F2.386403586504283664%2Fgluon%2Fsqlhtml.py&line=1259>,
 
in __init__ inp = self.widgets.options.widget(field, default) File 
"/base/data/home/apps/s~clubatletismosada/2.386403586504283664/gluon/sqlhtml.py",
 
line 313 
<https://console.developers.google.com/project/clubatletismosada/clouddev/debug/resolve_location?appModule=default&appVersion=2&timestampNanos=1439465598003000000&file=%2Fbase%2Fdata%2Fhome%2Fapps%2Fs~clubatletismosada%2F2.386403586504283664%2Fgluon%2Fsqlhtml.py&line=313>,
 
in widget options = requires[0].options() File 
"/base/data/home/apps/s~clubatletismosada/2.386403586504283664/gluon/validators.py",
 
line 586 
<https://console.developers.google.com/project/clubatletismosada/clouddev/debug/resolve_location?appModule=default&appVersion=2&timestampNanos=1439465598003000000&file=%2Fbase%2Fdata%2Fhome%2Fapps%2Fs~clubatletismosada%2F2.386403586504283664%2Fgluon%2Fvalidators.py&line=586>,
 
in options self.build_set() File 
"/base/data/home/apps/s~clubatletismosada/2.386403586504283664/gluon/validators.py",
 
line 572 
<https://console.developers.google.com/project/clubatletismosada/clouddev/debug/resolve_location?appModule=default&appVersion=2&timestampNanos=1439465598003000000&file=%2Fbase%2Fdata%2Fhome%2Fapps%2Fs~clubatletismosada%2F2.386403586504283664%2Fgluon%2Fvalidators.py&line=572>,
 
in build_set records = self.dbset(table).select(*fields, **dd) File 
"/base/data/home/apps/s~clubatletismosada/2.386403586504283664/gluon/packages/dal/pydal/objects.py",
 
line 2026 
<https://console.developers.google.com/project/clubatletismosada/clouddev/debug/resolve_location?appModule=default&appVersion=2&timestampNanos=1439465598003000000&file=%2Fbase%2Fdata%2Fhome%2Fapps%2Fs~clubatletismosada%2F2.386403586504283664%2Fgluon%2Fpackages%2Fdal%2Fpydal%2Fobjects.py&line=2026>,
 
in select return adapter.select(self.query,fields,attributes) File 
"/base/data/home/apps/s~clubatletismosada/2.386403586504283664/gluon/packages/dal/pydal/adapters/google_adapters.py",
 
line 484 
<https://console.developers.google.com/project/clubatletismosada/clouddev/debug/resolve_location?appModule=default&appVersion=2&timestampNanos=1439465598003000000&file=%2Fbase%2Fdata%2Fhome%2Fapps%2Fs~clubatletismosada%2F2.386403586504283664%2Fgluon%2Fpackages%2Fdal%2Fpydal%2Fadapters%2Fgoogle_adapters.py&line=484>,
 
in select (items, tablename, fields) = 
self.select_raw(query,fields,attributes) File 
"/base/data/home/apps/s~clubatletismosada/2.386403586504283664/gluon/packages/dal/pydal/adapters/google_adapters.py",
 
line 376 
<https://console.developers.google.com/project/clubatletismosada/clouddev/debug/resolve_location?appModule=default&appVersion=2&timestampNanos=1439465598003000000&file=%2Fbase%2Fdata%2Fhome%2Fapps%2Fs~clubatletismosada%2F2.386403586504283664%2Fgluon%2Fpackages%2Fdal%2Fpydal%2Fadapters%2Fgoogle_adapters.py&line=376>,
 
in select_raw filters = self.expand(query) File 
"/base/data/home/apps/s~clubatletismosada/2.386403586504283664/gluon/packages/dal/pydal/adapters/google_adapters.py",
 
line 237 
<https://console.developers.google.com/project/clubatletismosada/clouddev/debug/resolve_location?appModule=default&appVersion=2&timestampNanos=1439465598003000000&file=%2Fbase%2Fdata%2Fhome%2Fapps%2Fs~clubatletismosada%2F2.386403586504283664%2Fgluon%2Fpackages%2Fdal%2Fpydal%2Fadapters%2Fgoogle_adapters.py&line=237>,
 
in expand return expression.op(expression.first, expression.second) File 
"/base/data/home/apps/s~clubatletismosada/2.386403586504283664/gluon/packages/dal/pydal/adapters/google_adapters.py",
 
line 257 
<https://console.developers.google.com/project/clubatletismosada/clouddev/debug/resolve_location?appModule=default&appVersion=2&timestampNanos=1439465598003000000&file=%2Fbase%2Fdata%2Fhome%2Fapps%2Fs~clubatletismosada%2F2.386403586504283664%2Fgluon%2Fpackages%2Fdal%2Fpydal%2Fadapters%2Fgoogle_adapters.py&line=257>,
 
in AND return ndb.AND(first, second) File 
"/base/data/home/runtimes/python27/python27_lib/versions/1/google/appengine/ext/ndb/query.py",
 
line 558, in __new__ ' received a non-Node instance %r' % node) TypeError: 
ConjunctionNode() expects Node instances as arguments; received a non-Node 
instance None


This is the first hint I've found: 

https://cloud.google.com/appengine/docs/python/refdocs/modules/google/appengine/ext/ndb/query

Any help would be appreciated.

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[web2py] Error in GAE TypeError: ConjunctionNode()

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