radec_mid = SkyCoord(a_mid, d_mid, unit=(u.deg, u.deg))
columns = ['Gmag', 'BP-RP', 'RAJ2000', 'DEJ2000', 'ra', 'dec', 'pmra', 'mpdec', 'source_id']
custom_visizer = Vizier(columns=columns)
custom_visizer.ROW_LIMIT = -1

astropy.utils.data.clear_download_cache(hashorurl=None, pkgname='astropy')

stars_1 = custom_visizer.query_region(radec_mid, radius=self.telescope.fov, catalog='I/355/gaiadr3',
                                    **kwargs)
stars_2 = custom_visizer.query_region(radec_mid, radius=self.telescope.fov, catalog='I/350/gaiaedr3',
                                      **kwargs)

stars = XMatch.query(cat1=stars_1[0], cat2=stars_2[0], max_distance=1 * u.arcsec, colRA1='RAJ2000',
                     colDec1='DEJ2000', colRA2='RAJ2000', colDec2='RAJ2000')

Message: Missing parameter "cat1".
                 Trace:
cds.xmatch.exception.CmdParseException: Missing parameter "cat1".
        at cds.xmatch.servlet.SyncXMatch.exec(SyncXMatch.java:656)
        at cds.xmatch.servlet.SyncXMatch.doPost(SyncXMatch.java:476)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:650)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
        at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:218)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:498)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
        at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:962)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445)
        at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091)
        at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637)
        at org.apache.tomcat.util.net.AprEndpoint$SocketWithOptionsProcessor.run(AprEndpoint.java:2486)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1135)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
        at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
        at java.base/java.lang.Thread.run(Thread.java:844)

stars = XMatch.query(cat1=stars_1[0], cat2='vizier:I/350/gaiaedr3, max_distance=1 * u.arcsec, 
                    colRA1='RAJ2000', colDec1='DEJ2000' )