Error on Project Import

[Luis Basílio]

I'm performing a merge of instances and I imported successfully about 20 projects from another Jira server, but I'm facing the following error with a project:

 

2018-01-08 16:13:39,324 JiraTaskExectionThread-128 ERROR sysadmin 973x94448x2 1t0amf3 10.116.204.95 /secure/admin/ProjectImportSelectProject.jspa [c.a.j.imports.xml.DefaultBackupXmlParser] Unexpected import failure

java.lang.IllegalArgumentException: Passed List had more than one value.

There is no more specific details 

Both instances are on the same version - 7.5.0

[Luis Basílio · Accepted solution]

I found no explanation about this specific error, but I performed the import using Configuration Manager and all was solved.