Dear Engr. Marwan ,
This error appears when primavera can’t read the data you import from excel file and may be because one of the following reasons :
1- Project short name in excel doesn’t match the primavera project name
2- WBS Codes are different than the project ones
3- You entered the data type different than proper primavera data type , data in the excel cells should be text to be read in the primavera
please check theses steps and don’t hesitate to post again if you still have the same problem
Best Regards ,
Mahmoud Omara