How to use the linear referencing plugin?

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I need a guide how to use this plugin properly, I'm a newbie on PostGIS and I'm trying to use the linear referencing plugin of QGIS. I've created a database on postgreSQL with the postGIS extension and on QGIS with the Spit plugin I created a new connection with that DB. But, it generated some problems when it tries to connect, it says: fe_sendauth: no password supplied. But, I decided to save the username and the password when I made the connection and that problem it isn't showed.

So, in the next step I tried the plugin, with the configure tool, it show Connection OK, metadata OK. Then I go to Calibrate route, and as it's showed


It stops the calculation on the fourth step, and I don't know why. What do I need to have on each Attribute table to this works properly, or what do I do wrong?



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