Trying to create variable for tag_values but getting error

Hi I have integrated grafana with influxDB 2.0 and for making custom dashboard want to create variable for tags and tag values but getting below. Need help here for some guidance. I am getting drop downlist of tags which has list of 5 tags but for each tag I need to populate tag value
Error:

Templating

Template variables could not be initialized: schema collision: cannot group string and integer types together