Can you provide more information about your environment: Joomla version, BS myjspace version (please use the method requested on the top of the topic) ... other component installed on the server? I need a maximum of information to be able to reproduce the error.

This message is not coming directly from the BS MyJspace component or the myjspace editor, so you need to find the component/plugin which may interact with it. Please, let me know

joomla version is 3.4.5
BS myjspace version 2.4.5 last version
my components
acy sms pro
rsformrpo
com_profiles_v1.5
Jsitemap Proj3 2.3-3
tabulizer_4.1.13_unzip

and plugins
jautometa.2.2
jlsecuremysite_1.0.2
pkg_sigplus-1.4.2.19
plg_advga_joomla_3x
plg_byebyegenerator
plg_content_jextbox-social-share-buttons_v3.3.0_J2.5-3.3
plg_keywordlinks_v2.2
plg_seofli_v3-4
plg_system_popup_anywhere_j3.0
sourcerer-v4.4.8
tabs-v4.1.3

and my template is: jsn_gruve_pro_unlimited_3.0.0
i test and delet the components and plugins but no change

if you want i send you all may extention or akeeba back up of my site
thanks

You have many extensions!

Can you check into /language/en-GB files and /administrator/language/en-GB .ini files which on contains the error message that you had. This will provide idea about the extension producing the error message when using BS MyJspace ? This to know if another one than Joomla! itself can produce it.

Are you using the BS MyJspace default editor (or did you change it)? Do you remember what were the changes into your website before the issues?

The root cause is due to some ACL changes into Joomla 3.4.5. The users need now to have at least the ‘Editor Access right’ (related to Joomla content articles ACL) to have the access to the button feature.

I published a new version of BS MyJspace which is using a new specific pagebreak button (same look and functionalities) especially for BS MyJspace (not using any more this Joomla article editor button) and related to BS MyJspace ACL only.