Calculation and analysis – How to solve this differential equation? Error (NSolve :: ifun)

When I solve the differential equation I get an error:

error:
Solve :: ifun: Solve uses the inverse functions, so it is possible that some solutions are not found; use Reduce to obtain complete information of the solution.

Differential equation code:

DSolve[{(H'[x]) ^ 2 - ((1 + 6 H[x]^ 2) ^ 2 H[x]^ 2) / (
6 (1 + 18 H[x]^ 2)) + ((1 + 6 H[x]^ 2) ^ 2 E ^ -x) / (
18 (1 + 18 H[x]^ 2)) == 0, H[0] == 10 ^ (1)}, H, x]// FullSimplify

Thank you.