quando provo a modificare il peso ad un contenuto e mandarlo in anteprima mi esce il seguente errore :

* warning: Illegal offset type in isset or empty in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 1015.
* warning: Illegal offset type in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 1016.
* warning: Illegal offset type in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 1019.
* warning: Illegal offset type in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 592.
* warning: Illegal offset type in isset or empty in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 1015.
* warning: Illegal offset type in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 1016.
* warning: Illegal offset type in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 1019.
* warning: Illegal offset type in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 592.
* warning: Illegal offset type in isset or empty in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 1015.
* warning: Illegal offset type in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 1016.
* warning: Illegal offset type in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 1019.
* warning: Illegal offset type in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 592.
* warning: Illegal offset type in isset or empty in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 1015.
* warning: Illegal offset type in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 1016.
* warning: Illegal offset type in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 1019.
* warning: Illegal offset type in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 592.
* warning: Illegal offset type in isset or empty in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 1015.
* warning: Illegal offset type in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 1016.
* warning: Illegal offset type in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 1019.
* warning: Illegal offset type in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 592.
* warning: Illegal offset type in isset or empty in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 1015.
* warning: Illegal offset type in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 1016.
* warning: Illegal offset type in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 1019.
* warning: Illegal offset type in /home/sertecor/domains/ser-tec.org/public_html/modules/taxonomy/taxonomy.module on line 592.

se invece salvo non succede niente ma non mi mantiene il peso che rimane a zero.

cosa devo fare ????