SMN cant use CNJ Skill

I lvld my CNJ to lvl 4 and want to use aero with SMN but cant be used right now is there a bug?

It's not a bug. Jobs have a more focused skillset and purpose. They have access to much more limited cross class skills in exchange for job-exclusive abilities and increased stats. Summoner cannot use Conjurer spells.

But aero magic says that afinity with SMN

I see your character is level 35. At this point you're only allowed to use three cross class skills. Do you have too many set?

I saw on xivwiki that for some strange reason that SMN has ONLY Aero listed as a cross class skill when it already has three from THM and ARC. This could possibly be a bug.

Yes i only have 2 skills from thm so i can equip one more but when i change to smn i only can equip thm skill can select cnj skills....its strange

PD: sorry for my english ><

Thank you for submitting your report about not being able to use cross-class skills. We appreciate that you have taken time out of your day and away from playing FINAL FANTASY XIV: A Realm Reborn to let us know about this trouble so we can improve the experience of playing the game.

While we do appreciate that you have brought our attention to the trouble you experienced, the amount of information provided is insufficient for us to conduct an investigation into the cause of the trouble and how we can resolve it. To help provide some insight into the information we find valuable for looking into and resolving these errors, you can go to the Welcome to the "In-Game Bugs" Forum! (READ THIS FIRST) to find out what information we do need and why that information is important. There are also templates that we provide for reporting Windows errors and PS3 errors. We are certainly not going to require strict adherence to the templates, but they do help show the information we find important for those reports in an easy to fill out format. As long as the information is provided, however, feel free to use the format that feels most comfortable and informative to you.

We are looking forward to getting more information from you so we can look into this error and try to resolve it. Thank you for taking the time to provide more information about this error, and thank you for playing FINAL FANTASY XIV: A Realm Reborn.